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
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相关考题
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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 -
单项选择题
For COSPAS-SARSAT system,（）usually transmit initial COSPAS-SARSAT alert.
A.RCC
B.MCC
C.LUT
D.MRCC
