A bịa n'ihe gbasara ngwá ụlọ, ergonomics bụ isi ihe ị ga-atụle. Oche bụ ihe kacha mkpa nke ụlọ ọrụ, ma a na-elegharakarị ya anya. Ezigbo oche na-enye nkwado kwesịrị ekwesị, na-akwalite ọnọdụ dị mma, ma na-eme ka nkasi obi zuru oke. Mesh oche nwere ...
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