Peb khaws nrog txoj kev xav ntawm "zoo ua ntej, tus muab kev pabcuam thaum ua kom tau raws li cov neeg siv khoom" nrog kev tswj hwm thiab "xoom tsis txaus siab" raws li lub hom phiaj txheem. Kom zoo rau peb lub tuam txhab, peb xa cov khoom muag uas siv cov nqi tsim nyog tau ntawm tus nqi tsim nyog rau Copper (II) oxide granulate,Tooj liab chloride,Tooj Liab II Oxalate,Dub tooj liab oxide,Cuprous oxide hauv TshuagCov. Peb cov khoom lag luam raug kuaj xyuas ua ntej xa tawm, yog li peb tau txais lub koob npe zoo thoob plaws ntiaj teb. Peb tos ntsoov rau kev koom tes nrog koj yav tom ntej. Cov khoom yuav muab rau thoob plaws ntiaj teb, xws li Tebchaws Europe, Lahore, Lahore, Lahore, Lahore, Lahore, Lahore, Lahore kuj muaj kev yooj yim rau peb cov neeg siv khoom.
Tso koj cov lus