单项选择题

With the help of modern technology, ships are able to receive automated broadcast of safety messages（）.

A.by day or at night
B.almost round the clock
C.somewhat and sometime
D.from sunrise to sunset

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单项选择题

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

单项选择题

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

单项选择题

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