题目内容

-What about you, Mr. Rogers?-___________________________

A. No, but I’d like some water.
B. I am sorry you have to wait.
C. Please call me Paul.

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-Could we sit by the window?-___________________________

A. I am afraid those seats are reserved.
B. Yes, our dinner is ready.
C. The windows are broken.

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什么是上限截止频率？什么是下限截止频率？

什么是放大电路的通频带？哪些因素影响通频带？