(单选题)24: —Don’t you feel surprised to see George at the meeting. --Yes.I really didn’t think he here. A: has been B: had been C: would be D: would hav...
(单选题)23: 一Paul,_____? 一Oh,that’s my father! And beside him,my mother. A: what is the person over there B: who’s talking over there C: what are they doing D: which is that ...
(单选题)48: A:What are you looking for? B:I’m looking for a tool____. A: and open the box B: with that to open the box C: and opening the box D: to open the box ...
(单选题)22: A:What are you looking for? B:I’m looking for a tool____. A: and open the box B: with that to open the box C: and opening the box D: to open the box ...
(判断题)44: 闭环零点影响系统的稳定性( ) A: 错误 B: 正确 ...
(判断题)42: 可由闭环特征方程来判定最小相角系统的稳定性( ) A: 错误 B: 正确 ...
(单选题)40: 系统的频率特性 ( ) A: 是频率的函数 B: 与输入幅值有关 C: 与输出有关 D: 与时间t有关 ...
(单选题)19: I型单位反馈系统的闭环增益为 ( ) A: 与开环增益有关 B: 与传递函数的形式有关 C: 1 D: 与各环节的时间常数有关 ...
(单选题)14: 开环对数幅频特性中的中频段决定 ( ) A: 系统的型别 B: 系统的抗干扰能力 C: 系统的稳态误差 D: 系统的动态性能 ...
(单选题)28: 动态系统0初始条件是指t A: A B: B C: C D: D ...