Thawv chaw ua haujlwm muaj kev siv yooj yim installation, yooj yim txav, thiab txuag nqi, cov tsos kuj tuaj yeem ua ke ntawm qhov xav tau, raws li qhov xav tau ntawm cov duab sib dhos rau hauv cov duab sib txawv ntawm vaj tse, ua ib qho chaw ci ntsa iab ntawm lub nroog. .