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【单选题】
一个信道的数据传输率为4Kb/s,单向传播时延为30ms,如果使停止-等待协议的信道最大利用率达到8%,要求的数据帧长度至少为()A.
160bit
B.
320bit
C.
560bit
D.
960bit
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A.
which
B.
where
C.
that
D.
when
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