The sealing ụlọ ọrụ bụ ihe dị mkpa foundational ụlọ ọrụ n'ọtụtụ ebe na-eji dị iche iche ulo oru ubi, dị ka petrochemicals, coal chemicals, engineering ígwè, metallurgy, pharmaceuticals, nri, textiles, ụgbọala, ezinụlọ ngwa, wdg Dị ka nkewa nke mba eco ...
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