單項(xiàng)選擇題

Ships at sea are in urgent need of MSI because they are（）various kinds of danger.

A.subject for
B.liable to
C.easy to meet
D.always encounter

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單項(xiàng)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

單項(xiàng)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