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單項選擇題

The quality of EGC messages is（）affected by the position of the ship, the time of reception and climatic conditions.

A.sometimes
B.all times
C.never
D.partly

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單項選擇題

As each MSI message will have a unique identity, the printing of messages already received correctly is（）.

A.automatically suppressed
B.finished by the operator
C.manually suppressed
D.done again

單項選擇題

SafetyNet is an international service for the broadcast and automatic reception of MSI by means of direct-printing through（）system.

A.DSC
B.EPIRB
C.EGC
D.NBDP

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