A.at seaB.on landC.in the airD.throughout the worldThe ……

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

单项选择题The quality of EGC message is（）affected by the position of the ship, the time of reception and climatic condition.

A.sometimes
B.all times
C.never
D.partly