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问题 单项选择题

图示桥式整流电路电容滤波电路中，若二极管具有理想的特性，那么，当，RL=10kΩ，C=50μF时Uo约为：().

A．9V

B．10V

C．12V

D．14.14V

答案

参考答案：C

选择题

For a moment nothing happened. Then  ______all shouting together.

A．voices had came

B．did voices come

C．came voices

D．voices would come
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选择题

She is much ______ than last year.

[      ]

A. strong

B. stronger

C. strongest

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