单项选择题

Signals for locating will be transmitted in the 9GHz band by means of（）.

A.SART
B.DSC
C.NBDP
D.RT

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单项选择题

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

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

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