... back pulling 回采煤柱 backhand welding 右焊 baikalite 贝钙铁辉石 ...
基于126个网页-相关网页
短语
右焊法
rightward welding
;
backhand welding
;
rightward welding/backhand welding
;
backhand method
向右焊
backward welding
右向焊
[机]
rightward welding
;
backhand welding
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