Nyob rau hauv lub neej txhua hnub, peb feem ntau xa mus rau cov kav hlau hlau koom ua ke ua cov kav hlau, tab sis hauv kev teb cov yeeb nkab txiav, peb yuav tsum paub qhov txawv seb cov hlau puas yog cov yeeb nkab steel, silicon steel yeeb nkab, stainless hlau yeeb, titanium alloy yeeb los yog txhuas cov yeeb nkab. Cov. Vim tias cov khoom sib txawv nyias muaj nyias ...
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