Raws li cov huab cua ntim, peb tuaj yeem faib cov tshuab cua txias nrog cua ntim ntawm 18,000, 20,000, 25,000, 30,000, 50,000 lossis ntau dua. Yog tias peb faib nws los ntawm hom chav tsev tseem ceeb, peb tuaj yeem faib ua ob hom: mobile units thiab industrial units. Lub mobile unit yog yooj yim heev. Koj tuaj yeem siv ...
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