Ngezidingo zomphakathi, izinto ezengeziwe zisetshenziselwa ama-bearings, futhi insimbi yokuthwala izosetshenziswa, njengebhola lensimbi, indandatho yensimbi nokunye.Manje, i-China yenze impumelelo ethile ngensimbi enezinga eliphezulu, ekwazi ukuzimela futhi ithekelise ngaphandle, okuwusizo oluthile ekuthuthukisweni kweChina...
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