The direction of the current is reversed . 电流方向倒换。
2.
The boy moved restlessly from one foot to the other, keeping his eyes down, and for the most part only half singing . 那个男孩心神不定地倒换着两只脚，眼睛总是望着地，多半只是半心半意地唱。
3.
Replace one of the cooling water pumps for the brake 倒换一台刹车冷却水泵。
4.
Test methods of protection schemes for sdh rings Sdh环网保护倒换测试方法
5.
A new protection mechanism in rpr 弹性分组环中一种新型保护倒换机制
6.
The worn - out guide ring of the piston skirt should be renewed 活塞裙上磨损了的倒换应该换新。
7.
Two - fiber bidirectional linear switched ring 双纤双向线性倒换环
