单项选择题
The ARQ mode should be applied（）.
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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相关考题
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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 -
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
