A.when two stations communicate with each other
B.in any radio system and at any time
C.when one ship sends a message to another station
D.for communication among some stations
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A.SART
B.DSC
C.NBDP
D.RT
A.keep silence
B.interfere with such communication
C.establish communication as directed and render such assistance as is required and appropriate
D.refuse communication as directed and render such assistance as is required and appropriate
A.any appropriate channel except public communication
B.any appropriate channel except for public communications
C.any appropriate channel besides public communication
D.any appropriate channel beside public communication
A.between ship stations and shore-based communication networks
B.concern the management and operation of ships
C.may have an impact of the safety on ships
D.all of A, B, C
A.The message can be directed to the desired location
B.The message can follow the earth‟s curvature
C.The quality of message can not be affected by climatic
D.the range of the message extend and the quality of reception is improved
最新試題
The advantage of geostationary satellites is().
Before GMDSS, if the radio officer on board is serious ill,().
The frequency()the safety message will be transmitted shall be included in DSC safety call.
COSPAS-SARSAT is intended to be used for().
Particular care should be()in selecting CESs in areas where Ocean Regions overlap.
Stations in the United States of America are grouped by states arranged in the alphabetical order of their().
Radio beacon can be activated()in case of distress.
The vessel has stayed in port for seven days because she needs().
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.
Please use()for().