seamless steel tubes for structural purposes结构: structure; composition; cons ...用: 40分钟跑完全程 run the course in 4 ...无缝钢管: gapless rail; seamless steel ...结构用不锈钢无缝钢管: stainless steel seamless tubes for structures锅炉用无缝钢管: seamless steel pipc for boiler下载手机词典可随时随地查词查翻译
