电路的频率特性，是指对于不同频率的输入信号，其放大倍数的变化情况。高频时放大倍数下降，主要是因为 的影响；低频时放大倍数下降，主要是因为 的影响。
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当输入信号频率为fl或fh时，放大倍数的幅值下降为中频时的 ，或者是下降了 dB。此时与中频时相比，放大倍数的附加相移约为 。
Why should we hold a business plan meeting?
A. To seek others’ opinions and make the former one better.
B. To conduct a marketing research.
C. To meet the related persons.
D. To discuss the financial arrangements.
What is suggested when organizing a formal business plan meeting?
A. Casual dress.
B. Dinner clothes.
C. Office dress.
D. Informal dress.
Which person is not suitable to attend the business plan meeting?
A. Decision makers.
B. Experts.
C. Implementers.
D. Customers.
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