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。
The progress of hard anodizing investigation employing A. C. superimposed on D. C. , pulse current and alternating cu…
着重评述了交直流叠加，脉冲电流和交流电源在硬质阳极氧化研究中的进展情况。
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。
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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