A.SART
B.DSC
C.NBDP
D.RT
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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
A.are capable of following / distance
B.can follow / altitude
C.can hardly follow / shape
D.are unable following / angle
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（）will form the basis for distress alerting and safety calling.
Before GMDSS, if the radio officer on board is serious ill,（）.
The quality of EGC messages is（）affected by the position of the ship, the time of reception and climatic conditions.
As each MSI message will have a unique identity, the printing of messages already received correctly is（）.
On-scene communications will normally take place between（）.
What following is not among the function of SOLAS ships?（）
Radio beacon can be activated（）in case of distress.
For COSPAS-SARSAT system,（）usually transmit initial COSPAS-SARSAT alert.
Radiotelephony communication or radio telex communication or both will be carried out by terrestrial or satellite means,（）the equipment fitted on ship and the area in which the incident occurs.
The priority of EGC messages is classified by（）.