A.has been used
B.have been used
C.has used
D.have used
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A.have
B.had
C.are having
D.have had
A.repairs
B.repairing
C.repaired
D.being repaired
A.which is assisted
B.that assist you
C.when you assisted
D.when being assisting
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
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SOLAS ships shall be equipped with（）.
The frequency（）the safety message will be transmitted shall be included in DSC safety call.
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.
Radio communication（）for many years and helps to save tens of thousands of lives.
Before GMDSS, if the radio officer on board is serious ill,（）.
What following is not among the function of SOLAS ships?（）
As each MSI message will have a unique identity, the printing of messages already received correctly is（）.
Radiotelephony communication or radio telex communication or both will be carried out by terrestrial or satellite means,（）the equipment fitted on ship and the area in which the incident occurs.
The priority of EGC messages is classified by（）.
（）will form the basis for distress alerting and safety calling.