为了无畸变地记录地面振动频率范围内的有效波，必须设法提高地面——检波器系统的自然频率和阻尼。
参考答案：错
Hangzhou is ______ a beautiful place ______ almost everyone enjoys it very much. [ ]
A. so; that
B. such; as
C. such; that
D. so; as
两个因数的末尾一共有4个0，那么它们的积的末尾的0的个数就一定不会少于4个．______．
