high-frequency resistance welding (HFRW)高频电阻焊 high-frequency straight seam welded pipe高频直缝焊接钢管 high-frequency welding高频电焊high-speed welding快速焊接 ..
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The company now has six high-frequency straight seam welded pipe units, three hot-dip galvanizing line.
公司现拥有六条高频直缝焊管机组，三条热镀锌生产线。
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