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單項(xiàng)選擇題

（）are used for distress alerting as a rule.

A.SES/DSC/EPIRB
B.SART/radiotelephone
C.COSPAS-SARSAT
D.both B and C

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單項(xiàng)選擇題

Mariners can use DSC for（）.

A.general communication
B.distress alerting and safety calling
C.receive MSI
D.both B and C

單項(xiàng)選擇題

Equipment requirement vary according to（）.

A.Ship owner‟s will
B.economic condition
C.the area in which the ship operates
D.different orders of all countries

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