In the COSPAS-SARSAT system distress signals are processed by（）and the resulting data are forwarded to（）through（）communication network.

单项选择题The COSPAS-SARSAT system can provide distress alerts to the appropriate rescue authorities（）.

A.at sea
B.on land
C.in the air
D.throughout the world

单项选择题For COAPAS-SARSAT system,（）process the distress signal from EPIRB to determine its position and identity.

A.COSPAS-SARSAT
B.ground receiving stations
C.spacecraft
D.satellite SAR instrument

单项选择题The COSPAS-SARSAT system can provide distress alerts to the appropriate authorities（）.

A.anywhere in the world
B.at sea
C.in the air
D.ashore

单项选择题The COSPAS-SARSAT 406mhz system was adopted as an element of the GMDSS by IMO in（）.

A.1982
B.1980
C.1984
D.1988

单项选择题which function is the most important one of the GMDSS.（）

A.alerting
B.on-scene communication
C.safety information
D.general communication