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
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相关考题
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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 -
单项选择题
The（）is that search and rescue authorities ashore, as well as shipping in the immediate vicinity of the ship in distress, will be rapidly alerted to a distress incident so they can assist in a coordinated SAR operation with the minimun delay.
A.common communication system
B.distress traffic system
C.basic concept of GMDSS
D.SAR operation procedure
