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2 在 图 1 所示的各电路图中 , E = 5 V , u i = 10 sin ω tV ,二极 管 D 的正向压 降 可忽略不计,试分别画出输出电压 u 0 的波形。
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【简答题】Since new technologies are ever growing, employers now have the chance to monitor （监控） their employees to make them spare more time to work when they use their phones, computer terminals, emails and e...
【单选题】听力原文： Susan Anthony was born in Massachusetts in 1820 and died in Rochester, New York, in 1906. In the 1850's she saw many problems in her country and wanted to do something about them. One of these p...
A.
It had many problems.
B.
It was the most democratic country in the world.
C.
It was fair to women.
D.
It had some minor problems to solve.
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