... alternating-current electromagnetic 交流电磁 alternating-current welder 交流溶接机 alternating-current propulsion 交流电力牵引 ...
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We used to weld pipes with direct current(D. C)are welder(alternating current A. C. welder).
我们老是用直淌（交换）电弧焊机焊接收子。
We used to weld pipes with direct current (D. c) are welder (alternating current A. C. welder).
我们老是用直源(交换)电弧焊机焊接收子。
We used to weld pipes with direct current D. C. arc welder alternating current, a.
我们总是用直流(交流)电弧焊机焊接管子。
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