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【多选题】
帧中继与X.25相同之处在于A.
都基于虚电路
B.
都是分组交换技术
C.
都仅仅是第二层的协议
D.
都支持拥塞检测，确认重传，流量控制机制
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【单选题】My MP4 player isn't in my bag. Where _____ I have put it? [ ]
A.
can
B.
must
C.
should
D.
would