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
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相关考题
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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 -
单项选择题
COSPAS-SARSAT is intended to be used for（）.
A.distress alerting
B.locating 406mhz EPIRBs
C.storing distress signal
D.A and B
