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auto. 顶杆车顶支架杆件
el. 楼板梁
oil 顶板横梁
tech. 炉顶支柱; 拱顶梁; 拱顶; 洞顶木; 顶梁; 顶杆; 导坑主纵梁
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: 9 phrases in 1 subject
Technology9