Npaj ntawv pov thawj
Kev nyab xeeb ntawm scaffolding yog qhov tseem ceeb tshaj plaws rau kev scaffolding ntiaj teb. Tag nrho peb cov khoom muaj ntawv pov thawj los ntawm cov txheej txheem zoo. Rau txhua yam kev txiav txim cov khoom lag luam, peb tuaj yeem muab cov kev xeem cais thib peb rau cov qhua tuaj noj mov. Cov ntawv pov thawj peb tau dhau los muaj kev dhau los CE, SGS, Tuv, Iso3.
