题型:问答题 简答题 — Whose model train is this?— It's_________. [ ] A. David and Jim B. David's and Jim's C. David's and Jim D. David and Jim's 查看答案
题型:问答题 简答题 In HDLC protocol, when supervisory frame's type code is '00'. About the following state-ments, which is correct ( )A.receive readyB.receive not readyC.rejectD.selective reject 查看答案
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