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【多选题】
考虑一个令牌产生速率为R，大小为B的令牌桶，使用它来整形一个流。下列陈述哪是正确的？（多选）A.
如果网络中没有交叉通信，流的长期速度可以超过 R
B.
发送大小 B 一次突发量后， 流必须保持空闲，直到令牌桶重新完全地装满。
C.
在短时间内流的带宽速率可以超过 R
D.
如果一个流在长时间内处于空闲状态，它可以使用累积的令牌发送一次超过 B 字节的突发量
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