... downhill pipe line 下坡管线 downhill welding 下坡焊 downhill 沿坡向下 ...
基于46个网页-相关网页
downward welding in the inclined position
... 上坡焊upward welding in the inclined position 下坡焊downward welding in the inclined position 对接焊butt welding ...
基于10个网页-相关网页
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