Ebe a na-emepụta ihe na-ejikọta mmanụ, gas, ọkụ eletrik, na njikwa ọnụọgụ, ma nwee ike ịghọta otu oge nkedo nke akụkụ dị mgbagwoju anya dị ka diski, efere, shells, cams, molds, wdg, ma nwee ike mezue mkpọpu, igwe igwe, na-agwụ ike, gbasaa. , reaming, Rigid tapping na ndị ọzọ usoro na-ahaziri...
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