Cov txiaj ntsig ntawm Copper -}} coated hlau

Kev Tiv Thaiv Xub: Cov tawv tooj liab muab cov txheej tiv thaiv rau cov hlau vuam, zoo sib cais nws ntawm huab cua thiab noo noo, tiv thaiv nws lub neej pabcuam. Txhim kho vuam zoo: los ntawm kev tiv thaiv cov xeb, tooj -}} co weld tsis zoo rau kev ua tau zoo thaum muaj kev tsis taus, yog li hloov vuam zoo.