A.have
B.had
C.are having
D.have had
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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
A.it necessary
B.it is necessary
C.it necessary to
D.necessary
最新試題
For COSPAS-SARSAT system,（）usually transmit initial COSPAS-SARSAT alert.
The rescue coordination center may（）on stations which interfere with traffic.
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.
SafetyNet is an international service for the broadcast and automatic reception of MSI by means of direct-printing through（）system.
SOLAS ships shall be equipped with（）.
（）will form the basis for distress alerting and safety calling.
What following is not among the function of SOLAS ships?（）
Please use（）for（）.
COSPAS-SARSAT is intended to be used for（）.
The frequency（）the safety message will be transmitted shall be included in DSC safety call.