Dabere na ndokwa na ihe achọrọ nke GB / T20234.2-2015, ọ nwere ike ịkwụ ụgwọ EV niile arụpụtara na china, n'ụzọ ziri ezi na nke ọma na nnukwu ndakọrịta.
Iji usoro nrụgide riveting na-enweghị nke ọ bụla nke nwere ọdịdị mara mma.Nhazi ejiri aka na-akwado ụkpụrụ ergonomic, plọg nke ọma.Isi nke ntụtụ na-eji ihe mkpuchi mkpuchi iji gbochie kọntaktị na aka kpọmkwem.Onye ahịa nwere ike ịwụnye gbt chaja n'ime ụlọ ma ọ bụ n'èzí, dịka ihe achọrọ n'ezie.Ịkpọchi chaja nke ọma na ụgbọ elu azụ nwụnye nwere ike igbochi izu ohi.