单项选择题

In the GMDSS, MSI broadcasts will be made on two dedicated systems:（）and（）.

A.NBDP/VHF radio
B.Inmarsat safetyNet/NAVTEX
C.Safety service / Inmarsat-A
D.Long range / short range

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单项选择题

A.FEC and ARQ
B.satellite and terrestrial communications
C.radio and telex
D.NBDP

单项选择题

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

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