题目内容

多级放大器总的噪声系数主要取决于前面两级,与后面各级的噪声系数关系不大。

A. 对
B. 错

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为了兼顾低噪声、高增益和工作稳定性方面的要求,低噪声放大设备的前两级通常采用共射-共基级联放大电路。

A. 对
B. 错

She's been to ___ countries, and she's not done yet!

A. 92
B. 82
C. 29
D. 28

The number of native Gaelic speaker in Scotland has dwindled to just _____, as of the ____ cencus.

A. 75,375; 2011
B. 57,375; 2011
C. 57,735; 2007
D. 57,357; 2007

Since using Facebood Ads, we've seen a ____ increase in traffic to our website.

A. 6.9%
B. 8.6%
C. 6.8%
D. 9.6%

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