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Kev siv cov khoom siv tooj dag
Brass yog cov hlau alloy uas ua los ntawm tooj liab thiab zinc.Vim yog tooj dag cov khoom tshwj xeeb, uas kuv yuav nkag mus rau hauv cov ncauj lus kom ntxaws hauv qab no, nws yog ib qho ntawm cov khoom siv dav tshaj plaws.Vim tias nws cov khoom siv ntau yam, muaj qhov zoo li kev lag luam tsis muaj qhov kawg thiab cov khoom siv los ntawm thi...Nyeem ntxiv