题目内容

当有用信号的频率低于100 Hz时,应采用__________滤波电路。

A. 低通
B. 高通
C. 带通
D. 带阻

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How much does it cost for five stamps?

A. 20 cents.
B. $1.00
C. $2.20.

半导体二极管的重要特性之一是__________。

A. 温度稳定性
B. 单向导电性
C. 放大作用
D. 滤波特性

Why was Dora late?

A. She didn't know the time.
B. She forgot her class.
C. She didn't catch the bus.

二阶压控电压源低通有源滤波器通带外幅频响应曲线的斜率为_________。

A. 20 dB/十倍频程
B. -20 dB/十倍频程
C. 40 dB十倍频程
D. -40 dB/十倍频程

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