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Yuav kom txhim kho kev paub ntawm cov neeg siv khoom, txhawb kom cov neeg siv khoom ntseeg siab rau kev siv cov khoom hlau thiab tsim kom muaj lub koob npe nrov ntawm peb lub tuam txhab cov kev pabcuam kev txawj ntse, thaum Lub Ib Hlis 7 thiab 8, Xiamen Zhanzhi Die Steel Industry, nyob rau hauv t...Nyeem ntxiv
