1. Cov txheej txheem ntxuav: Xaus Kev Sau Dej → Yaug nrog dej huv ntawm 40 ℃ → Cyclic ntxuav nrog cov kua ntxuav (alkali) ntawm 85 ℃ → Yaug nrog dej huv ntawm 40 ℃ → Cyclic ntxuav nrog ntxuav cov kua (alkali) ntawm 85 → inse Yaug nrog dej huv. Qhov kub tshwj xeeb yog raws li qhov ntsuas kub pom zoo ntawm cov chaw tsim khoom huv. Feem ntau, qhov ntsuas kub ntawm txhua feem uas xav tau los ntawm cov chaw tsim khoom huv […]