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【简答题】
以下关于电路交换和分组交换的描述正确的是( ) A分组交换网络资源利用率低 B分组交换延迟大,传输实时性差 C电路交换网络资源利用率高 D电路交换延迟小,传输实时性强
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皮皮学刷刷变学霸
举一反三
【单选题】一个心动周期中相当于房室瓣开始关闭至开始开放的时是
A.
心室收缩期和等容舒张期之和
B.
心室舒张期和等容收缩期之和
C.
心室舒张期
D.
房缩期和心室收缩之和
E.
心室收缩期
【单选题】听力原文：M: I don't share your enthusiasm for automobile racing. W: If you had been with us, Stanly, you would have understood our excitement. Q: What do we learn from the conversation? (18)
A.
The woman had been to the race and she was very excited.
B.
The man had been to the race and he was very excited.
C.
Both of them had been to the race and were very excited.
D.
Both of them had been to the race but the woman was not excited.
【简答题】奥迪01J无级变速器主要由哪几部分组成?
【简答题】某放大器幅频特性波特图如下图 ,则其中频电压增益为 __________dB,通频带为____________,在上限频率下的电压增益为__________dB;影响其高频响应的主要因素有________________,影响其低频响应的主要因素有__________________。
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