Ọkpụkpụ roba bụ ụdị eriri nke ejiri rọba mee mgbanwe dị mma na nguzogide abrasion, nke a na-ejikarị eme ihe na ụlọ ọrụ, ọrụ ugbo, ihe owuwu na ụgbọ ala. Ọ nwere ike ibufe mmiri mmiri, gas na ihe siri ike, ma nwee ezigbo nguzogide okpomọkụ dị elu, corrosion na nrụgide, yana i ...
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