问题
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
答案
参考答案：B
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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
参考答案：B