硅整流交流发电机中改变输出电压大小的构件是硅二极管。
参考答案：错
请说明下列现象属于哪种物态变化：用久了的电灯灯丝变细：______现象；春天的早晨经常出现大雾：______现象；铁水冶成齿轮：______现象．
How does Walter get along with his new business().
A.He has failed in business again.
B.His new company is doing rather well.
C.He hopes to succeed in business.
