【单选题】设非线性系统状态方程为:【图片】【图片】试确定平衡状态的稳定性
【单选题】听力原文:She could have closed the garage door. Did she close the garage door?
A.
Yes, she did. I asked her to close it.
B.
No, she didn't though she could.
C.
No, but she is going to close it.
【判断题】对于线性定常系统,当系统矩阵A为非奇异时, 系统只有一个平衡状态 xe=0 ,如果平衡状态 xe是 渐近稳定的,就一定是大范围渐近稳定的。
【单选题】My wife often forgets the door, but she remembered it when she left yesterday. [ ]
【简答题】enter into/sign/close a contract
【单选题】The doctor let her eyes. [ ]
【简答题】某二阶非线性系统的相平面和一条相轨迹如图8-47所示,图中原点0为平衡状态,B0段的相轨迹方程为x 2 =2x,AB段为平行于x轴的线段。试求相点从A运动到原点所需的时间。
【判断题】选择规定回流比时, 输入值>0,表示实际回流比;输入值<-1,其绝对值表示实际回流比与最小回流比的比值。