画出三极管基本放大电路图。
参考答案:
如图E-2所示。
— Excuse me, what time is it now?
— Sorry, my watch ____. It _____ at the shop. [ ]
A. isn't working; is being repaired
B. doesn't work; is being repaired
C. isn't working; is repaired
D. doesn't work; is repaired
干式电抗器精益化评价细则中要求电抗器接地应为()接地、不应构成闭合环路。
A.明
B.暗
C.一点
D.双