单项选择题
In case a ship is in emergency or distress in any of 4 areas, it is required to use the continuous（）alert.
A.MF/HF
B.SART
C.EPIRB
D.any of A, B, C
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相关考题
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单项选择题
Radio beacon can be activated（）in case of distress.
A.only automatically
B.only manually
C.both automatically and manually
D.only by remote control -
单项选择题
If the beacon is mounted at a wrong place, it may（）by sea water, chemicals, exhaust and vibrations.
A.be damaged
B.work normally regardless of harmful conditions
C.not wok though it is not in a bad condition -
单项选择题
By using（）system a ship can send a distress message and know with certainty it will be received.
A.COSPAS-SARSAT
B.SATELLITE
C.terrestrial radio
D.INMARSAT
