如图所示的四幅实验装置中，能反映发电机工作原理的是[ ]
A.
B.
C.
D.
答案：D
对某个数据库对象重命名的宏操作是______。
A．CopyObject
B．DeleteObject
C．Save
D．Rename
Your friend Lili used to play the piano, _______? [ ]
A. used she
B. doesn't she
C. didn't she
D. did she
