截止频率
参考答案：
共基极电流增益幅值变为其低频值的1根号2时的频率，就是截止频率。
—Do you like cats ?
—Of course . They mean a kind of pet to their masters .
A．better than
B．more than
C．no more than
D．not more than
试述过滤器理论。
