单项选择题

A.received alreadlyB.have receivedC.had receivedD.was r……

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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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

单项选择题（）communication are intership VHF radio telephone communication.

A.ship-to-shore
B.shore-to –ship
C.bridge-to-bridge

单项选择题From IMO’S point of view, INMARSAT’s most important function is the provision of（）.

A.general radio communication
B.MSI
C.improved distress and safety communication
D.bridge-to-bridge communication