单项选择题
International SafetyNet and Navtex Services promulgate MSI by means of（）.
A.FEC and ARQ
B.satellite and terrestrial communications
C.radio and telex
D.NBDP
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相关考题
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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 -
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
