一个可控硅回路需要哪几部分组成？
参考答案：
有主回路、脉冲触发电路、控制脉冲相位的控制电路。
A: which dog is yours?
B: Look over there. The one _____. [ ]
A. with eyes widely open
B. has eyes open wide
C. with eyes wide open
D. has eyes widely open
什么是自熔性矿石？
