Thaum hluav taws kub, ntau cov pa roj carbon monoxide (CO), hydrogen sulfide (H2S), nitrogen dioxide (NO2), hydrogen cyanide (HCN), thiab lwm yam. los ntawm tib neeg lub cev. Nws yog tsim los ntawm kev ua ntawm cov ntsiab lus carbon (C), hydrogen (H), oxygen (O), sulfur (S), phosphorus (P), nitrogen (N), thiab lwm yam uas pleev combustibles nrog huab cua.
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