The ARQ mode should be applied（）.<br>A:when two stations communicate with each other<br>B:in any radio system and at any time<br>C:when one ship sends a message to another station<br>D:for communication among some stations

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

出自：海船船员证

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