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單項選擇題

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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單項選擇題

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

單項選擇題

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