【简答题】已知单位负反馈系统,开环传递函数为(2s+2)/(s^2+2s+1) (1)利用MATLAB对该闭环系统建立传递函数模型; (2)将第一问中求得的传递函数模型转化为零极点增益模型和状态空间表达式。 要求:上传程序代码及运行结果。
【多选题】机械设备修理的类别按修理内容、技术要求和工作量大小可分为几类。
【简答题】How and why Jack came to China______ (be) not known.
【单选题】听力原文:W: Jack, would you mind driving me to the station? M: Sure, why not! Q: How does Jack respond to the question? (7)
A.
He refused to drive her.
B.
He is glad to drive her.
C.
He forgot his driver's license.
【单选题】听力原文:W: Jack, would you mind driving me to the station? M: Sure, why not? Q: How does Jack respond to the question? (5)
A.
He refused to drive her.
C.
He forgot his driver's license.
D.
He is glad to drive her.
【单选题】Jack was soon told ________ he did was not necessary.
【单选题】听力原文:W: Jack, would you mind driving me to the station? M: Sure, why not! Q: How does Jack respond to the question? (12)
A.
He refused to drive her.
B.
He is glad to drive her.
C.
He forgot his driver's license.
【多选题】机械设备修理类别按修理内容、技术要求和工作量大小分为( ) 等几类。