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【单选题】
放大电路的输入信号频率升高到上限截止频率时,放大倍数幅值下降到中频放大倍数的 ______ 倍(a. 0.7 b. 0.5), 放大倍数的相位与中频时相比,变化了约 ________ 度(a. 45 b. 90)。
A.
a,a
B.
a,b
C.
b,b
D.
b,a
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