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Feem ntau siv ntawm cov khoom tooj dag
Tooj dag yog cov hlau alloy uas yog ua los ntawm tooj liab thiab zinc. Vim yog tooj dag cov khoom tshwj xeeb, uas kuv yuav mus rau hauv kev nthuav dav ntxiv rau hauv qab no, nws yog ib qho ntawm cov feem ntau siv alloys. Vim tias nws cov versatility, thiaj li tsis muaj kev lag luam thiab siv cov khoom lag luam tsis zoo li cas ...Nyeem ntxiv