... double-action a.双作用 down-vertical welding下行焊 draft(draught)n.吃水 ...
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vertical down welding 向下立焊 ; 立向下焊
electrode for vertical down welding 向下立焊条 ; 下行焊条
electrode of vertical down welding 立向下焊条
vertical down position welding 向下立焊
vertical down welding technology 下向焊工艺
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