1, Kev Tsim Nyog Hlau yog cov khoom siv raw rau casting steel daim hlau, kav dej, tuav, xov hlau, castings, thiab lwm yam khoom siv hlau, thiab nws cov khoom tuaj yeem cuam tshuam qhov kev xav tau ntawm cov hlau.Kev tsim cov hlau tsis huv tau pom tias muaj kev nce ntxiv hauv 2018 (tsuas yog vim qhov kev tso tawm ntawm crud ...
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