1. Cov ntaub ntawv ua haujlwm siv nyob rau hauv lub tshuab txiav tawm yog cov roj nplua xws li acetylene, roj ntsha, liquefied roj thiab lwm yam. Yog li, nws yog ib qho tsim nyog yuav tsum tau xyuas ib ntus seb tag nrho cov pa hluav taws xob puas raug muab khi ua ke.
2. Khaws cov roj qhov ntawm lub tshuab txiav tawm kom deb ntawm qhib cov nplaim taws thiab muab cov pa roj carbon dioxide los yog lwm yam khoom tua hluav taws uas tsim nyog nyob ze nws.
3. Tus tswj hwm yuav tsum tswj nws hauv lub sijhawm kom kho qhov hluav taws kub kom tsis txhob muaj hluav taws.