Dị ka ihe dị mkpa na-akwado n'ibu ngwaahịa, brass valves na brass oyiyi akwa na-ọtụtụ ebe na-eji ọkụ eletrik, petrochemical, metallurgy, gburugburu ebe obibi nchedo, coal na ndị ọzọ ubi nke mba aku na uba na mmiri nchekwa, obodo ewu ewu na ndị ọzọ akụrụngwa ewu.T...
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