交流电力电子开关的电路结构与交流调压电路完全相同。
查看答案
交流调压电路中两只反并联的晶闸管可以用双向晶闸管代替
A. 对
B. 错
下列乘积中,哪些可构成相应阶数的行列式的项?
A. a41 a32 a23 a14 a55;
B. a34 a25 a43 a12;
C. a12 a23 a34 a14;
D. a12 a23… a(n-1,n) a(n1)
WHICH way can help you to save money?
A. 30 days rule
B. pay yourself 10% of your income
C. write a shopping list and stick to it
D. cut off your TV