[国开形考作业] ____the War of Independence, the United States was an Englis 日期:2021-10-25 15:05:17 点击:169 好评:0
(单选题)27: ____the War of Independence, the United States was an English colony. A: Before B: At C: In D: Between ...
[国开形考作业] The rainstorm has damaged the crops. The loss has not yet be 日期:2021-10-25 15:04:35 点击:122 好评:0
(单选题)21: The rainstorm has damaged the crops. The loss has not yet been _________accurately, but it is believed to be well beyond a million dollars. A: considered B: assessed C: explored D: calculated ...
[国开形考作业] Did you notice the guy_______head looked like a big potato? 日期:2021-10-25 15:03:55 点击:103 好评:0
(单选题)15: Did you notice the guy_______head looked like a big potato? A: who B: which C: whose D: whom ...
[国开形考作业] The teacher told them ________ make so much noise. 日期:2021-10-25 15:02:20 点击:108 好评:0
(单选题)3: The teacher told them ________ make so much noise. A: don't B: not C: will not D: not to ...
[国开形考作业] 对数相频特性曲线与-180°线相交处的频率,或者说频率特性函数的 日期:2021-10-25 15:01:31 点击:92 好评:0
(判断题)47: 对数相频特性曲线与-180°线相交处的频率,或者说频率特性函数的相位等于-180°时的频率,称为相位穿越频率或相位交界频率。( ) A: 对 B: 错 ...
[国开形考作业] 控制系统的根轨迹必对称于实轴。 ( ) 日期:2021-10-25 15:00:48 点击:67 好评:0
(判断题)41: 控制系统的根轨迹必对称于实轴。 ( ) A: 对 B: 错 ...
[国开形考作业] 下列哪种措施对提高系统的稳定性没有效果 ( ) 日期:2021-10-25 14:59:43 点击:57 好评:0
(单选题)29: 下列哪种措施对提高系统的稳定性没有效果 ( ) A: 增加开环极点 B: 在积分环节外加单位负反馈 C: 增加开环零点 D: 引入串联超前校正装置 ...
[国开形考作业] 微分环节的对数幅频曲线为过点(1,j0)的直线,其斜率为( ) 日期:2021-10-25 14:59:08 点击:115 好评:0
(单选题)23: 微分环节的对数幅频曲线为过点(1,j0)的直线,其斜率为( ) A: -20dB/dec B: 20dB/dec C: -40dB/dec D: 40dB/dec ...
[国开形考作业] 一阶系统的单位阶跃响应曲线中,时间常数 T 时刻对应的响应为稳态 日期:2021-10-25 14:58:17 点击:106 好评:0
(单选题)16: 一阶系统的单位阶跃响应曲线中,时间常数 T 时刻对应的响应为稳态响应的( ) A: 98% B: 95% C: 87% D: 66.3% ...
[国开形考作业] 一阶系统Φ(s)=1/(Ts+1)的单位斜坡响应的稳态误差为( ) 日期:2021-10-25 14:57:05 点击:145 好评:0
(单选题)4: 一阶系统Φ(s)=1/(Ts+1)的单位斜坡响应的稳态误差为( ) A: T B: 1/T C: 0 D: ∞ ...