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
What following is not among the function of SOLAS ships?（）
On-scene communications will normally take place between（）.
If the beacon is mounted at a wrong place, it may（）by sea water, chemicals, exhaust and vibrations.
SafetyNet is an international service for the broadcast and automatic reception of MSI by means of direct-printing through（）system.
For COSPAS-SARSAT system,（）usually transmit initial COSPAS-SARSAT alert.
SOLAS ships shall be equipped with（）.
Radio communication（）for many years and helps to save tens of thousands of lives.
The rescue coordination center may（）on stations which interfere with traffic.
We consider（）send a helicopter with medical facilities to the distress area.
Stations in the United States of America are grouped by states arranged in the alphabetical order of their（）.