A.4
B.9
C.8
D.5
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A.the weather over there is always terrible
B.the condition there is complicated
C.the signals are too strong
D.their SES may receive the signals from unwanted satellite
A.sometimes
B.all times
C.never
D.partly
A.the only preamble
B.a part of the preamble
C.the closing
D.the suspension
A.have received
B.have been received
C.are received
D.are being received
A.400
B.240
C.450
D.180
最新試題
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.
The quality of EGC messages is（）affected by the position of the ship, the time of reception and climatic conditions.
By using（）system a ship can send a distress message and know with certainty it will be received.
If the beacon is mounted at a wrong place, it may（）by sea water, chemicals, exhaust and vibrations.
The priority of EGC messages is classified by（）.
Particular care should be（）in selecting CESs in areas where Ocean Regions overlap.
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.
Monitoring is especially important in a highly automated system which is dependent on careful（）procedure and format.
Distress traffic is the communication（）between the station in distress and the ships, aircraft, coast radio stations, coast earth stations and rescue centers participating in the rescue work.
Ship-to-ship distress alerting should be conducted by（）.