A.received alreadly
B.have received
C.had received
D.was receiving
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A.MF
B.VHF
C.HF
D.LF
A.1995
B.1998
C.1999
D.2000
A.common communication system
B.distress traffic system
C.basic concept of GMDSS
D.SAR operation procedure
A.ship-to-shore
B.shore-to –ship
C.bridge-to-bridge
A.general radio communication
B.MSI
C.improved distress and safety communication
D.bridge-to-bridge communication
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Stations in the United States of America are grouped by states arranged in the alphabetical order of their（）.
Please use（）for（）.
The frequency（）the safety message will be transmitted shall be included in DSC safety call.
By using（）system a ship can send a distress message and know with certainty it will be received.
If the beacon is mounted at a wrong place, it may（）by sea water, chemicals, exhaust and vibrations.
For COSPAS-SARSAT system,（）usually transmit initial COSPAS-SARSAT alert.
Radio communication（）for many years and helps to save tens of thousands of lives.
International Navtex service means the coordinated broadcast and automatic reception on（）khz of maritime safety information by narrow-band direct-printing telegraphy using English language.
Every lifeboat which is fitted with a fixed two-way（）radiotelephone apparatus with an antenna which is separately mounted shall be provided with arrangements for sitting and securing the antenna effectively in its operating position.
（）by an ice-breaker, it is important to maintain a continuous listening watch on the appropriate VHF channel and to maintain a proper look-out for sound and visual signals.