... 三相整流焊机three phase rectifier welder 三相低频焊机three phase low frequency 万能滚焊机universal seam welder ...
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three phase low frequency welder 三相低频焊机
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Although they have not been found to cause any harm, the cables on conventional pylons, which transmit a three-phase alternating current, generate a strong electric field and a continuous buzz of low-frequency radio waves.
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