Nyob rau hauv cov nqe lus ntawm ntau lawm txoj kev, nws kuj yuav muab faib mus rau hauv welded steel kav rau kev thauj mus los tsis tshua muaj siab kua, welded steel kav, kauv welded steel kav, thiab lwm yam. Seamless steel yeeb nkab yuav siv tau rau ntau yam kua thiab roj pipelines. Welded kav yuav siv tau rau cov kav dej, cov kav dej...
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