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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

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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

單項選擇題

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

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