三相变压器采用Y,△联接时,则联接组的标号一定是()。
A、奇数
B、偶数
C、奇偶均可
D、一固定常数
参考答案:A
The police were seeking more information to find out _____ the rich merchant.
A.who was it that killed
B.who it was that killed
C.it was who killed
D.who was it killed
“十一五”时期,城乡区域发展趋向协调,城镇化率应提高到( )。
A.37%B.67%C.57%D.47%