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【简答题】

直接通电能响的是 蜂鸣器,输入脉冲才能响的是 蜂鸣器。

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参考解析:
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【单选题】Some pessimistic experts feel that the automobile is bound to fall into disuse. They see a day in the not-too-distant future when all autos will be abandoned and allowed to rust. Other authorities, ho...

A.
How to render automobiles pollution-free.
B.
How to make smaller and safer automobiles.
C.
How to solve the problem of traffic jams.
D.
How to develop an automated subway system.

【单选题】输入阶跃信号稳定的系统在输入脉冲信号时()

A.
将变成不稳定系统
B.
其稳定性变好
C.
其稳定性不变
D.
其稳定性变差