串联电容器可以()功率因数。
A.提高
B.降低
C.不变
D.其他三个选项都不是
参考答案:A
“If" he added, “________ to carry out the plan, we would surely make a big profit for our company."
A.to permit
B.to be permitted
C.permitting
D.Permitted
阿莫西林的化学结构中R基为().
A.A
B.B
C.C
D.D
E.E