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
Before GMDSS, if the radio officer on board is serious ill,（）.
Radio beacon can be activated（）in case of distress.
On-scene communications will normally take place between（）.
The vessel has stayed in port for seven days because she needs（）.
Monitoring is especially important in a highly automated system which is dependent on careful（）procedure and format.
SafetyNet is an international service for the broadcast and automatic reception of MSI by means of direct-printing through（）system.
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.
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.
All coast radio stations（）DSC installed for VHF and HF.
Can MF/HF radiotelephone receive the MSI sent from the coast stations alone?（）