Lub luag haujlwm tseem ceeb ntawm cov laum tw cov tawv hlau suav nrog kho thiab koom nrog ntau cov ntaub ntawv. Tus Tsov tus tw ntawm cov ntsia hlau laum ntsia hlau yog tsim qauv ntawm tus Tsov tus tw, uas tso cai rau kev ua kom ncaj qha rau cov khoom siv tsis tau ntxiv, yog li lub sijhawm txuag tsim kho
Cov. Cov xwm txheej tshwj xeeb suav nrog:
Txhim kho cov vuas hlau xim hauv cov qauv steel: Laum tus ntsia hlau vuas luaj hauv cov qauv xim, kom muaj kev ruaj ntseg thiab ruaj khov ntawm kev sib txuas.
Daim nyias nyias ntawv kho rau cov vaj tse yooj yim: nws kuj yog tsim nyog rau cov ntawv yooj yim, cov vaj tse, chaw nyob thiab lwm qhov chaw, thiab ua haujlwm zoo, nqi thiab ntseeg tau.
Qhov rooj, qhov rai thiab cov ntaub thaiv npog nruab nrab