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Becuse of e mchinery nd equipment into e new rte is on e second-hnd mchine ppernce, service life, use time comprehensive evlution of mny fctors, cn be more close to e ctul vlue of second-hnd equipment, ccording to e rtio of deprecition to new rte of equipment erefore, is meod is e preferred meod of evlution of second-hnd mchine deprecition equipment.