电容器形成电容电流有多种工作状态,它们是()。
A.充电
B.放电
C.稳定状态
参考答案:A, B
At last,the boy acknowledged the money from his mother’s pocket.
A.having stolen
B.to have stolen
C.have stolen
D.having been stolen
A lot of students have tried, but_____ have passed the test. [ ]
A. a few
B. a little
C. little
D. few