单项选择题
In the GMDSS, distress alerting can be transmitted in（）directions.
A.1
B.2
C.3
D.4
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相关考题
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单项选择题
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 -
单项选择题
The frequency 156.525MHZ and 156.8MHZ should be used in the band of（）.
A.MF
B.VHF
C.HF
D.LF -
单项选择题
Actually, the date for entry into effect will be 1st February（）.Though the text does not tell us about it.
A.1995
B.1998
C.1999
D.2000
