單項(xiàng)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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1.單項(xiàng)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
2.單項(xiàng)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
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