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Zuag qhia tag nrho cov vaj huam sib luag tsim yog khoom kim heev thiab txaus nyiam, lub ntsej muag xim yog tsaus ntsuab thiab xim av (muab raws li qhov xav tau ntawm cov xim sib txawv ntawm cov qauv vaj tse sab hauv tshwj tsis yog cov qauv xim). Tus qauv tsim ntawm lub ntsej muag npog muab qhov zoo nkauj thiab muaj kuab heev. Cov ntshiab lvory.high lub zog, yeej tsis hloov xim, pob tshab yog PC. Tsau hom, yooj yim structureand yooj yim installation.