cov khoom

piav qhia luv luv:

Cov khoom no yog siv los tsim cov txheej txheem dej tsis sib xws JS, Cov txheej txheem dej tsis sib xws uas tsim los ntawm nws yog ntsuab, tsis muaj tshuaj lom, tsis muaj teeb meem thiab tsis muaj kuab paug. Ceev ceev kom qhuav, luv lub sijhawm tsim kho; JS txheej txheem dej tsis sib xws tuaj yeem ua rau qhov chaw tsis zoo, tsis tas yuav muaj txheej tiv thaiv; Nws muaj cov dej tsis zoo; Siv tau rau lub sijhawm ntev hauv qhov chaw; JS txheej txheem dej tsis sib xws muaj zog tiv thaiv kev laus, tiv taus kub thiab qis, khov thiab yaj tsis kam, thiab tuaj yeem tiv thaiv cov hlau tuav los ntawm corrosion.JS txheej txheem dej tsis sib xws yooj yim, tuaj yeem tsim rau ntawm qhov chaw ntub dej thiab sib txuas ruaj khov, tuaj yeem kho tau, txuas cov kab nrib pleb zoo.