单选题The ARQ mode should be applied（）.Awhen two stations communicate with each otherBin any radio system and at any timeCwhen one ship sends a message to another stationDfor communication among some stations
单选题
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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