A.which is assisted
B.that assist you
C.when you assisted
D.when being assisting
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A.the range of antenna can cover everywhere in the world
B.we can know the ship’s exact position
C.that the distress alert can be located as soon as possible
D.antenna of permanent earth stations may be directed towards fixed points in the sky
A.which
B.on which
C.at which
D.in which
A.it necessary
B.it is necessary
C.it necessary to
D.necessary
A.depend on
B.depending on
C.dependent on
D.depended on
A.exchange
B.to exchange
C.exchanging
D.exchanged
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Before GMDSS, if the radio officer on board is serious ill,（）.
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 vhf radiotelephone apparatus with（）which is separately mounted shall be provided with arrangements for sitting and securing the antenna effectively in its operating position.
The frequency（）the safety message will be transmitted shall be included in DSC safety call.
If the beacon is mounted at a wrong place, it may（）by sea water, chemicals, exhaust and vibrations.
Please use（）for（）.
At least two two-way VHF radiotelephone apparatus shall be provided on every cargo ship of（）tons gross tonnage and upwards but less than 500 tons gross tonnage.
Radio communication（）for many years and helps to save tens of thousands of lives.
Ship-to-ship distress alerting should be conducted by（）.
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.