()电压等级运行的线路,通过变压器电磁回路的连接而构成的环路,叫做电磁环网。
A.相同
B.不同
C.可能相同
D.其他三个选项都不是
参考答案:B
完成句子
①他双手颤抖着把信打开.
He opened the letter with ___________ .
②她擦去脸上的汗水.
She ___________ from her face.
③在网球比赛之后他一身是汗.
He was ___________ after his tennis match