单词:Oxy Acetylene Welding
[网络] 氧乙炔焊;氧乙炔焊接;气焊
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科技之光
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英语博客 A cup of English
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实用英语
iron and steel industry 钢铁工业 ironworks 铁厂 foundry 铸造车间 steelworks, steel mill 钢厂 coking plant 炼焦厂 electrometallurgy 电冶金学 powder metallurgy 粉末冶金学 blast f
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英文语法词汇