單項(xiàng)選擇題

When the power of a SART is on , it will（）.

A.transmit distress signal
B.send response signal
C.transmit the signal of ship‟s position
D.be interrogated by X-band radar

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單項(xiàng)選擇題

The SART should provide a（）indication of its correct operation and should also inform survivors when it is interrogated by radar.

A.sight or sound
B.seeing or sounding
C.visual or audible
D.seeing or hearing

單項(xiàng)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