A.was suffering
B.is suffering
C.has suffered
D.has been suffering
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A.see
B.seeing
C.be seen
D.being seen
A.where
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B./
C.When
D.What
A.If
B.Whenever
C.Because
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A.transmit
B.to transmitting
C.transmitting
D.in transmitting
最新試題
Stations in the United States of America are grouped by states arranged in the alphabetical order of their（）.
Can MF/HF radiotelephone receive the MSI sent from the coast stations alone?（）
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.
Please use（）for（）.
Particular care should be（）in selecting CESs in areas where Ocean Regions overlap.
The quality of EGC messages is（）affected by the position of the ship, the time of reception and climatic conditions.
If the beacon is mounted at a wrong place, it may（）by sea water, chemicals, exhaust and vibrations.
The rescue coordination center may（）on stations which interfere with traffic.
On-scene communications will normally take place between（）.
（）will form the basis for distress alerting and safety calling.