选择题:---- Lily, nice to see you ! ______ to England ?

题目内容:
---- Lily, nice to see you ! ______ to England ?

---- Yes. And I will come back in a week. ( ) A A. Have you gone
B B. Are you going
C C. Have you been
D D. Did you go

参考答案:

已知某系统奈奎斯特图见图2所示,其与负实轴的交点是(1,j0)点,则该系统的稳定性为( )。

已知某系统奈奎斯特图见图2所示,其与负实轴的交点是(1,j0)点,则该系统的稳定性为( )。A A. 稳定B B. 临界稳定C C. 不稳定D D. 不能判断

查看答案