單項選擇題

The ARQ mode should be applied（）.

A.when two stations communicate with each other
B.in any radio system and at any time
C.when one ship sends a message to another station
D.for communication among some stations

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單項選擇題

Signals for locating will be transmitted in the 9GHz band by means of（）.

A.SART
B.DSC
C.NBDP
D.RT

單項選擇題

A ship station on receiving a shore-to-ship distress alert should（）.

A.keep silence
B.interfere with such communication
C.establish communication as directed and render such assistance as is required and appropriate
D.refuse communication as directed and render such assistance as is required and appropriate