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
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相关考题
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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
