Age structure:

0-14 years: 37% (male 1,088,579; female 1,042,087)

15-64 years: 58% (male 1,575,806; female 1,748,250)

65 years and over: 5% (male 135,556; female 161,789) (July 1998 est.)

Population growth rate: 1.57% (1998 est.)

Birth rate: 26.71 births/1,000 population (1998 est.)

Death rate: 6.32 deaths/1,000 population (1998 est.)

Net migration rate: -4.73 migrant(s)/1,000 population (1998 est.)

Sex ratio:

at birth: 1.05 male(s)/female

under 15 years: 1.04 male(s)/female

15-64 years: 0.9 male(s)/female

65 years and over: 0.84 male(s)/female (1998 est.)

Infant mortality rate: 29.07 deaths/1,000 live births (1998 est.)

Life expectancy at birth:

total population: 69.66 years

male: 66.31 years

female: 73.17 years (1998 est.)

Total fertility rate: 3.06 children born/woman (1998 est.)

Nationality:

noun: Salvadoran(s)

adjective: Salvadoran

Ethnic groups: mestizo 94%, Amerindian 5%, white 1%

Religions: Roman Catholic 75%

note: there is extensive activity by Protestant groups throughout the

country; by the end of 1992, there were an estimated 1 million

Protestant evangelicals in El Salvador

Languages: Spanish, Nahua (among some Amerindians)

Literacy:

definition: age 15 and over can read and write

total population: 71.5%

male: 73.5%

female: 69.8% (1995 est.)

@El Salvador:Government

Country name:

conventional long form: Republic of El Salvador

conventional short form: El Salvador

local long form: Republica de El Salvador

local short form: El Salvador

Data code: ES

Government type: republic

National capital: San Salvador

Administrative divisions: 14 departments (departamentos,

singular-departamento); Ahuachapan, Cabanas, Chalatenango, Cuscatlan,

La Libertad, La Paz, La Union, Morazan, San Miguel, San Salvador,

Santa Ana, San Vicente, Sonsonate, Usulutan

Independence: 15 September 1821 (from Spain)

National holiday: Independence Day, 15 September (1821)

Constitution: 20 December 1983

Legal system: based on civil and Roman law, with traces of common law;

judicial review of legislative acts in the Supreme Court; accepts

compulsory ICJ jurisdiction, with reservations

note: Legislative Assembly passed landmark judicial reforms in 1996

Suffrage: 18 years of age; universal

Executive branch:

chief of state: President Armando CALDERON Sol (since 1 June 1994);

Vice President Enrique BORGO Bustamante (since 1 June 1994); note-the

president is both the chief of state and head of government

head of government: President Armando CALDERON Sol (since 1 June

1994); Vice President Enrique BORGO Bustamante (since 1 June 1994);

note-the president is both the chief of state and head of government

cabinet: Council of Ministers

elections: president and vice president elected on the same ticket by

popular vote for five-year terms; election last held 20 March 1994,

with a run-off election held 24 April 1994 (next to be held NA March

1999)

election results: Armando CALDERON Sol elected president; percent of

vote-Armando CALDERON Sol (ARENA) 49.03%, Ruben ZAMORA Rivas

(CD/FMLN/MNR) 24.09%, Fidel CHAVEZ Mena (PDC) 16.39%, other 10.49%;

because no candidate received a majority, a run-off election was held

and the results were as follows-Armando CALDERON Sol (ARENA) 68.35%,

Ruben ZAMORA Rivas (CD/FMLN/MNR) 31.65%

Legislative branch: unicameral Legislative Assembly or Asamblea

Legislativa (84 seats; members are elected by direct popular vote to

serve three-year terms)

elections: last held 16 March 1997 (next to be held NA March 2000)

election results: percent of vote by party-ARENA 35.4%, FMLN 34.3%,

PCN 8.1%, PDC 7.9%, CD 3.8%, PRSC 3.4%, PLD 3.2%, MU 2.1%, PD 1.0%,

other 0.8%; seats by party - ARENA 28, FMLN 27, PCN 9, PDC 8, PRSC 3,

CD 2, PLD 2, MU 1, PD 1, independent 3

Judicial branch: Supreme Court (Corte Suprema), judges are selected by

the Legislative Assembly

Political parties and leaders: National Republican Alliance or ARENA

[Alfredo CRISTIANI]; Farabundo Marti National Liberation Front or FMLN

[Facundo GUARDADO, general coordinator]; Christian Democratic Party or

PDC [Ronal UMANA, secretary general; title in dispute]; National

Conciliation Party or PCN [Ciro CRUZ Zepeda, secretary general];

Democratic Convergence or CD [Ruben ZAMORA, secretary general];

Popular Labor Party or PPL [Jose VILANOVA, secretary general]; Liberal

Democratic Party or PLD [Kirio Waldo SALGADO, president]; Social

Christian Union or USC (formed by union of the PRSC, MU, and MSN)

[Abraham RODRIGUEZ, president]; Democratic Party or PD [Ana Guadeloupe

MARTINEZ, president]

Political pressure groups and leaders:

labor organizations: National Confederation of Salvadoran Workers

(CNTS)National Union of Salvadoran Workers (UNTS); Federation of the

Construction Industry, Similar, Transport and other activities

(FESINCONTRANS); Salvadoran Workers Central (CTS); Port Industry Union

of El Salvador (SIPES); Electrical Industry Union of El Salvador

(SIES); Workers Union of Electrical Corporation (STCEL)

business organizations: Salvadoran Industrial Association

(ASI)Salvadoran Assembly Industry Association (ASIC); National

Association of Small Enterprise (ANEP)

International organization participation: BCIE, CACM, ECLAC, FAO,

G-77, IADB, IAEA, IBRD, ICAO, ICFTU, ICRM, IDA, IFAD, IFC, IFRCS, ILO,

IMF, IMO, Intelsat, Interpol, IOC, IOM, ITU, LAES, LAIA (observer),

MINURSO, NAM (observer), OAS, OPANAL, PCA, UN, UNCTAD, UNESCO, UNIDO,

UPU, WCL, WFTU, WHO, WIPO, WMO, WToO, WTrO

Diplomatic representation in the US:

chief of mission: Ambassador Rene A. LEON

chancery: 2308 California Street NW, Washington, DC 20008

telephone: [1] (202) 265-9671, 9672

consulate(s) general: Chicago, Dallas, Houston, Los Angeles, Miami,

New Orleans, New York, and San Francisco

consulate(s): Boston

Diplomatic representation from the US:

chief of mission: Ambassador Anne W. PATTERSON

embassy: Final Boulevard Santa Elena, Station Antiguo Cuscatlan, San

Salvador

mailing address: Unit 3116, APO AA 34023

telephone: [503] 278-4444

FAX: [503] 278-6011

Flag description: three equal horizontal bands of blue (top), white,

and blue with the national coat of arms centered in the white band;

the coat of arms features a round emblem encircled by the words

REPUBLICA DE EL SALVADOR EN LA AMERICA CENTRAL; similar to the flag of

Nicaragua, which has a different coat of arms centered in the white

band-it features a triangle encircled by the words REPUBLICA DE

NICARAGUA on top and AMERICA CENTRAL on the bottom; also similar to

the flag of Honduras, which has five blue stars arranged in an X

pattern centered in the white band

@El Salvador:Economy

Economy-overview: In 1997 the government emphasized a fixed exchange

rate, along with conservative monetary and fiscal policies to promote

foreign investment. Inflation fell to an unprecedented low of 2%.

Exports reached a record level and were the main engine of growth.

Productivity in other sectors remained weaker, however. For the last

few years, El Salvador has experienced sizable deficits in both its

trade and its fiscal accounts. The trade deficit has been offset by

remittances from the large number of Salvadorans living abroad and

from external aid. The deficit is expected to increase in 1998 as

imports continue to rise. San Salvador is stepping up its

privatization efforts in 1998 to increase revenues. Late in 1997 the

legislative assembly approved a privatization law that will facilitate

the sale of the state-owned telephone company sometime in 1998. The

government also plans to privatize pension funds later in the year.

GDP: purchasing power parity-$17.8 billion (1997 est.)

GDP-real growth rate: 4% (1997 est.)

GDP-per capita: purchasing power parity-$3,000 (1997 est.)

GDP-composition by sector:

agriculture: 15%

industry: 24%

services: 61% (1997 est.)

Inflation rate-consumer price index: 2% (1997)

Labor force:

total: 2.26 million (1997 est.)

by occupation: agriculture 40%, commerce 16%, manufacturing 15%,

government 13%, financial services 9%, transportation 6%, other 1%

Unemployment rate: 7.7% (1997 est.)

Budget:

revenues: $1.75 billion

expenditures: $1.82 billion, including capital expenditures of $317

million (1997 est.)

Industries: food processing, beverages, petroleum, chemicals,

fertilizer, textiles, furniture, light metals

Industrial production growth rate: 7% (1997 est.)

Electricity-capacity: 900,000 kW (1996)

Electricity-production: 3.5 billion kWh (1997)

Electricity-consumption per capita: 603 kWh (1997 est.)

Agriculture-products: coffee, sugarcane, corn, rice, beans, oilseed,

cotton, sorghum; beef, dairy products; shrimp

Exports:

total value: $1.96 billion (f.o.b., 1997 est.)

commodities: coffee, sugar; shrimp; textiles

partners: US, Guatemala, Germany, Costa Rica, Honduras

Imports:

total value: $3.5 billion (c.i.f., 1997 est.)

commodities: raw materials, consumer goods, capital goods, fuels

partners: US, Guatemala, Mexico, Panama, Venezuela, Japan

Debt-external: $2.6 billion (yearend 1997)

Economic aid:

recipient: ODA, $763 million (1996)

note: US has committed $280 million in economic assistance to El

Salvador for 1995-97 (excludes military aid)

Currency: 1 Salvadoran colon (C) = 100 centavos

Exchange rates: Salvadoran colones (C) per US$1 (end of period)-8.755

(January 1998-1995), 8.750 (1994), 8.670 (1993)

note: as of 1 June 1990, the rate is based on the average of the

buying and selling rates, set on a weekly basis, for official receipts

and payments, imports of petroleum, and coffee exports; prior to that

date, a system of floating was in effect

Fiscal year: calendar year

Communications

Telephones: 350,000 (1997 est.)

Telephone system:

domestic: nationwide microwave radio relay system

international: satellite earth station-1 Intelsat (Atlantic Ocean);

connected to Central American Microwave System

Radio broadcast stations: AM 18, FM 80, shortwave 2

Radios: 1.5 million (1997 est.)

Television broadcast stations: 11 (1996 est.)

Televisions: 700,000 (1997 est.)

@El Salvador:Transportation

Railways:

total: 602 km (single track; note-some sections abandoned, unusable,

or operating at reduced capacity)

narrow gauge: 602 km 0.914-m gauge

Highways:

total: 9,977 km

paved: 1,985 km (including 266 km of expressways)

unpaved: 7,992 km (1996 est.)

Waterways: Rio Lempa partially navigable

Ports and harbors: Acajutla, Puerto Cutuco, La Libertad, La Union,

Puerto El Triunfo

Merchant marine: none

Airports: 88 (1997 est.)

Airports-with paved runways:

total: 4

over 3,047 m: 1

1,524 to 2,437 m: 1

914 to 1,523 m: 2 (1997 est.)

Airports-with unpaved runways:

total: 84

914 to 1,523 m: 18

under 914 m: 66 (1997 est.)

Heliports: 1 (1997 est.)

@El Salvador:Military

Military branches: Army, Navy, Air Force

Military manpower-military age: 18 years of age

Military manpower-availability:

males age 15-49: 1,362,504 (1998 est.)

Military manpower-fit for military service:

males: 864,419 (1998 est.)

Military manpower-reaching military age annually:

males: 65,130 (1998 est.)

Military expenditures-dollar figure: $104 million (1997)

Military expenditures-percent of GDP: 0.9% (1997)

@El Salvador:Transnational Issues

Disputes-international: land boundary dispute with Honduras mostly

resolved by 11 September 1992 International Court of Justice (ICJ)

decision; the presidents of Honduras and El Salvador signed in January

1998 an agreement allowing citizens in the 1992 demarcated areas to

choose Honduran or Salvadoran citizenship; the two countries also

agreed to a final demarcation of the border within one year; the

agreement awaits ratification by the legislative assemblies of both

countries; with respect to the maritime boundary in the Golfo de

Fonseca, ICJ referred to an earlier agreement in this century and

advised that some tripartite resolution among El Salvador, Honduras

and Nicaragua likely would be required

Illicit drugs: transshipment point for cocaine; marijuana produced for

local consumption

______________________________________________________________________

EQUATORIAL GUINEA

@Equatorial Guinea:Geography

Location: Western Africa, bordering the Bight of Biafra, between

Cameroon and Gabon

Geographic coordinates: 2 00 N, 10 00 E

Map references: Africa

Area:

total: 28,050 sq km

land: 28,050 sq km

water: 0 sq km

Area-comparative: slightly smaller than Maryland

Land boundaries:

total: 539 km

border countries: Cameroon 189 km, Gabon 350 km

Coastline: 296 km

Maritime claims:

exclusive economic zone: 200 nm

territorial sea: 12 nm

Climate: tropical; always hot, humid

Terrain: coastal plains rise to interior hills; islands are volcanic

Elevation extremes:

lowest point: Atlantic Ocean 0 m

highest point: Mount Malabo 3,008 m

Natural resources: timber, petroleum, small unexploited deposits of

gold, manganese, uranium

Land use:

arable land: 5%

permanent crops: 4%

permanent pastures: 4%

forests and woodland: 46%

other: 41% (1993 est.)

Irrigated land: NA sq km

Natural hazards: violent windstorms

Environment-current issues: tap water is not potable; desertification

Environment-international agreements:

party to: Biodiversity, Desertification, Endangered Species, Law of

the Sea, Nuclear Test Ban, Ship Pollution

signed, but not ratified: none of the selected agreements

Geography-note: insular and continental regions rather widely

separated

@Equatorial Guinea:People

Population: 454,001 (July 1998 est.)

Age structure:

0-14 years: 43% (male 97,993; female 97,470)

15-64 years: 53% (male 114,960; female 126,453)

65 years and over: 4% (male 7,597; female 9,528) (July 1998 est.)

Population growth rate: 2.56% (1998 est.)

Birth rate: 38.9 births/1,000 population (1998 est.)

Death rate: 13.32 deaths/1,000 population (1998 est.)

Net migration rate: 0 migrant(s)/1,000 population (1998 est.)

Sex ratio:

at birth: 1.03 male(s)/female

under 15 years: 1 male(s)/female

15-64 years: 0.9 male(s)/female

65 years and over: 0.79 male(s)/female (1998 est.)

Infant mortality rate: 93.45 deaths/1,000 live births (1998 est.)

Life expectancy at birth:

total population: 53.93 years

male: 51.61 years

female: 56.31 years (1998 est.)

Total fertility rate: 5.06 children born/woman (1998 est.)

Nationality:

noun: Equatorial Guinean(s) or Equatoguinean(s)

adjective: Equatorial Guinean or Equatoguinean

Ethnic groups: Bioko (primarily Bubi, some Fernandinos), Rio Muni

(primarily Fang), Europeans less than 1,000, mostly Spanish

Religions: nominally Christian and predominantly Roman Catholic, pagan

practices

Languages: Spanish (official), French (official), pidgin English,

Fang, Bubi, Ibo

Literacy:

definition: age 15 and over can read and write

total population: 78.5%

male: 89.6%

female: 68.1% (1995 est.)

@Equatorial Guinea:Government

Country name:

conventional long form: Republic of Equatorial Guinea

conventional short form: Equatorial Guinea

local long form: Republica de Guinea Ecuatorial

local short form: Guinea Ecuatorial

former: Spanish Guinea

Data code: EK

Government type: republic in transition to multiparty democracy

National capital: Malabo

Administrative divisions: 7 provinces (provincias,

singular-provincia); Annobon, Bioko Norte, Bioko Sur, Centro Sur,

Kie-Ntem, Litoral, Wele-Nzas

Independence: 12 October 1968 (from Spain)

National holiday: Independence Day, 12 October (1968)

Constitution: approved by national referendum 17 November 1991;

emended January 1995

Legal system: partly based on Spanish civil law and tribal custom

Suffrage: 18 years of age; universal adult

Executive branch:

chief of state: President Brig. Gen. (Ret.) Teodoro OBIANG NGUEMA

MBASOGO (since 3 August 1979)

head of government: Prime Minister Serafin Seriche DOUGAN (since April

1996); First Vice Prime Minister for Foreign Affairs Miguel OYONO

(since January 1998); Second Vice Prime Minister for Internal Affairs

Demetrio Elo NDONG NGEFUMU (since January 1998)

cabinet: Council of Ministers appointed by the president

elections: president elected by popular vote to a seven-year term;

election last held 25 February 1996 (next to be held NA February 2003)

election results: President OBIANG NGUEMA MBASOGO reelected without

opposition; percent of popular vote-98%

Legislative branch: unicameral House of Peoples Representatives or

Camara de Representantes del Pueblo (80 seats; members are directly

elected by popular vote to serve five-year terms)

elections: last held 21 November 1993 (next to be held NA 1998)

election results: percent of vote by party-NA; seats by party-PDGE 68,

CSDP 6, UDS 5, CLD 1

Judicial branch: Supreme Tribunal

Political parties and leaders:

ruling party: Democratic Party for Equatorial Guinea or PDGE [Brig.

Gen. (Ret.) Teodoro OBIANG NGUEMA MBASOGO]

opposition parties: Convergence Party for Social Democracy or CPDS

[Santiago OBAMA, president; Placido Miko ABOGO, secretary-general];

Democratic Social Union or UDS [Camelo MODU, general secretary];

Liberal Democratic Convention or CLD [Alfonso Nsue MIFUMU, president];

Liberal Party or PL [Santos PASCUAL]; National Democratic Union or

UDENA [Jose MECHEBA Ikaka, president]; National Movement of the

Liberation of Equatorial Guinea or MONALIGE [Dr. Aldolfo Obrang BIKO,

president]; Party of the Social Democratic Coalition or PCSD

[Buenaventura Moswi M'Asumu, general coordinator]; Party of Progress

or PP [Mocache MEINGA, interim chairman]; Popular Action of Equatorial

Guinea or APGE [Casiano Masi Edu]; Popular Union or UP [Juan BITUI,

president]; Party for Progress of Equatorial Guinea or PPGE [Basilio

Ava Eworo and Domingo ABUY]; Progressive Democratic Alliance or ADP

[Antonio-Ebang Mbele Abang, president]; Social Democratic and Popular

Convergence or CSDP [Secundino Oyono Agueng Ada, general secretary];

Social Democratic Party or PSD [Benjamin-Gabriel Balingha Balinga

Alene, general secretary]; Socialist Party of Equatorial Guinea or

PSGE [Tomas MICHEBE Fernandez, general secretary]

International organization participation: ACCT, ACP, AfDB, BDEAC,

CEEAC, ECA, FAO, FZ, G-77, IBRD, ICAO, ICRM, IDA, IFAD, IFC, IFRCS,

ILO, IMF, IMO, Intelsat, Interpol, IOC, ITU, NAM, OAS (observer), OAU,

UDEAC, UN, UNCTAD, UNESCO, UNIDO, UPU, WHO, WToO, WTrO (applicant)

Diplomatic representation in the US:

chief of mission: Ambassador Pastor Micha ONDO BILE

chancery: Suite 405, 1511 K Street NW, Washington, DC 20005

telephone: [1] (202) 393-0525

FAX: [1] (202) 393-0348

Diplomatic representation from the US: the US does not have an embassy

in Equatorial Guinea (embassy closed September 1995); US relations

with Equatorial Guinea are handled through the US Embassy in Yaounde,

Cameroon

Flag description: three equal horizontal bands of green (top), white,

and red with a blue isosceles triangle based on the hoist side and the

coat of arms centered in the white band; the coat of arms has six

yellow six-pointed stars (representing the mainland and five offshore

islands) above a gray shield bearing a silk-cotton tree and below

which is a scroll with the motto UNIDAD, PAZ, JUSTICIA (Unity, Peace,

Justice)

@Equatorial Guinea:Economy

Economy-overview: The discovery and exploitation of large oil reserves

have contributed to dramatic economic growth in recent years. Farming,

forestry, and fishing are also major components of GDP. Subsistence

farming predominates. Although pre-independence Equatorial Guinea

counted on cocoa production for hard currency earnings, the

deterioration of the rural economy under successive brutal regimes has

diminished potential for agriculture-led growth. A number of aid

programs sponsored by the World Bank and the IMF have been cut off

since 1993 because of the government's gross corruption and

mismanagement. Businesses, for the most part, are owned by government

officials and their family members. Undeveloped natural resources

include titanium, iron ore, manganese, uranium, and alluvial gold. The

country responded favorably to the devaluation of the CFA franc in

January 1994.

GDP: purchasing power parity-$660 million (1997 est.)

GDP-real growth rate: NA%

GDP-per capita: purchasing power parity-$1,500 (1997 est.)

GDP-composition by sector:

agriculture: 46%

industry: 33%

services: 21% (1995 est.)

Inflation rate-consumer price index: 6% (1996 est.)

Labor force: NA

Unemployment rate: NA%

Budget:

revenues: $47 million

expenditures: $43 million, including capital expenditures of $7

million (1996 est.)

Industries: fishing, sawmilling

Industrial production growth rate: 7.4% (1994 est.)

Electricity-capacity: 5,000 kW (1995)

Electricity-production: 20 million kWh (1995)

Electricity-consumption per capita: 48 kWh (1995)

Agriculture-products: coffee, cocoa, rice, yams, cassava (tapioca),

bananas, palm oil nuts, manioc; livestock; timber

Exports:

total value: $197 million (f.o.b., 1996 est.)

commodities: petroleum, timber, cocoa

partners: US 34%, Japan 17%, Spain 13%, China 13%, Nigeria

Imports:

total value: $248 million (c.i.f., 1996 est.)

commodities: petroleum, food, beverages, clothing, machinery

partners: Cameroon 40%, Spain 18%, France 14%, US 8%

Debt-external: $254 million (1996 est.)

Economic aid:

recipient: ODA, $NA

Currency: 1 Communaute Financiere Africaine franc (CFAF) = 100

centimes

Exchange rates: CFA francs (CFAF) per US$1-608.36 (January 1998),

583.67 (1997), 511.55 (1996), 499.15 (1995), 555.20 (1994), 283.16

(1993)

note: beginning 12 January 1994, the CFA franc was devalued to CFAF

100 per French franc from CFAF 50 at which it had been fixed since

1948

Fiscal year: 1 April-31 March

Communications

Telephones: 2,000 (1987 est.)

Telephone system: poor system with adequate government services

domestic: NA

international: international communications from Bata and Malabo to

African and European countries; satellite earth station-1 Intelsat

(Indian Ocean)

Radio broadcast stations: AM 2, FM 0, shortwave 0

Radios: NA

Television broadcast stations: 1

Televisions: 4,000 (1992 est.)

@Equatorial Guinea:Transportation

Railways:

total: 0 km

Highways:

total: 2,820 km

paved: 0 km

unpaved: 2,820 km (1995 est.)

Ports and harbors: Bata, Luba, Malabo

Merchant marine:

total: 19 ships (1,000 GRT or over) totaling 66,766 GRT/84,780 DWT

ships by type: bulk 1, cargo 16, passenger 1, passenger-cargo 1 (1997

est.)

Airports: 3 (1997 est.)

Airports-with paved runways:

total: 2

2,438 to 3,047 m: 1

1,524 to 2,437 m: 1 (1997 est.)

Airports-with unpaved runways:

total: 1

under 914 m: 1 (1997 est.)

@Equatorial Guinea:Military

Military branches: Army, Navy, Air Force, Rapid Intervention Force,

National Police

Military manpower-availability:

males age 15-49: 98,960 (1998 est.)

Military manpower-fit for military service:

males: 50,308 (1998 est.)

Military expenditures-dollar figure: $2.5 million (FY93/94)

Military expenditures-percent of GDP: NA%

@Equatorial Guinea:Transnational Issues

Disputes-international: maritime boundary dispute with Gabon because

of disputed sovereignty over islands in Corisco Bay; maritime boundary

dispute with Nigeria because of disputed jurisdiction over oil-rich

areas in the Gulf of Guinea

______________________________________________________________________

ERITREA

Introduction

Historical perspective: On 29 May 1991, ISAIAS Afworki, secretary

general of the People's Front for Democracy and Justice (PFDJ), which

then served as the country's legislative body, announced the formation

of the Provisional Government in Eritrea (PGE) in preparation for the

23-25 April 1993 referendum on independence for the Autonomous Region

of Eritrea; the referendum resulted in a landslide vote for

independence, which was proclaimed on 27 April 1993.

@Eritrea:Geography

Location: Eastern Africa, bordering the Red Sea, between Djibouti and

Sudan

The 1998 CIA World Factbook · 第 34 / 142 段