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Kev ua cov roj av yog cov txheej txheem ntawm kev tshem tawm cov pa dej, hydrogen sulfide, mercaptan, thiab carbon dioxide ntawm cov roj av. Cov khoom siv tseem ceeb suav nrog chav dehydration, chav desulfurization, chav decarbonization, thiab lub teeb hydrocarbon...
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