單項選擇題

In the GMDSS, distress alerting can be transmitted in（）directions.

A.1
B.2
C.3
D.4

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單項選擇題

We（）the distress signal on our own radio before the shore station relayed it to us.

A.received alreadly
B.have received
C.had received
D.was receiving

單項選擇題

The frequency 156.525MHZ and 156.8MHZ should be used in the band of（）.

A.MF
B.VHF
C.HF
D.LF