單項(xiàng)選擇題A ship station on receiving a shore-to-ship distress alert should（）.

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


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1.單項(xiàng)選擇題What channel is general communication used?（）

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

2.單項(xiàng)選擇題General communications are those communications（）.

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

3.單項(xiàng)選擇題What’s the advantage when using the satellites?（）

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

4.單項(xiàng)選擇題Some radio waves（）the surface of the earth because of its（）.

A.are capable of following / distance
B.can follow / altitude
C.can hardly follow / shape
D.are unable following / angle

5.單項(xiàng)選擇題Ships equipped with Inmarsat SES send distress alerts both（）.

A.quick and good
B.convenient and certain
C.easily and simply
D.important and difficult