单项式-22πR3的系数是:______,次数是:______次.
单项式-22πR3的系数是:-22π,次数是:三.
用weather或climate填空。
1. These flowers will not grow in cold _____ .
2. _____ permitting, we'll go out for a camp next weekend.
3. The _____ forecast said it would be fine all day.
4. Los Angeles has a warm, dry _____.
5. The plant has already conditioned to the northern _____ .
装设分段电抗器的作用是()。
A.限制母线回路中的短路电流
B.改善母线的电压质量
C.吸收多余的无功功率
D.改进用户的功率因数