单项选择题
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
相关考题
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单项选择题
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 -
单项选择题
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 -
单项选择题
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
