河水灌進靴子,風一吹,你猜發生了什麼?
Tippers and dumpers carrying backfilling fine earth traveling along the pipeline one after another, the workers, with th
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一看見就會的水平固定管焊接運條手法!
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When using multi wire welding, it is better to use thinner front wire: if the diameter of the original external welding
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青銅 waviness 波形起伏work 工件 working allowance 加工餘量working dischard 加工廢料鍛鑄造關連用語accretion 爐瘤 acid converter 酸性轉爐acid lining cu