单项选择题
A.only automatically B.only manually C.both automatically and manually D.only by remote control
If the beacon is mounted at a wrong place, it may（）by s...
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
By using（）system a ship can send a distress message and...
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
For COSPAS-SARSAT system,（）usually transmit initial COS...
单项选择题For COSPAS-SARSAT system,（）usually transmit initial COSPAS-SARSAT alert.
A.RCC B.MCC C.LUT D.MRCC
