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１问题的提出石家庄机务段是北京铁路局东风４内燃机车架修基地。月均架修机车约１０台，年均约１２０台。一台机车有牵引电动机６台，每台有一套３２４２６轴承。传统的架修方法是无论轴承好坏。全部更换。据调研，每年换下来的轴承中约有５０％完全可以正常使用。即每年大约?
1 raised the issue Shijiazhuang locomotive depot is the Beijing Railway Bureau Dongfeng 4 diesel locomotive repair base. Average monthly repair locomotive about 10 units, an average of about 120 units. A locomotive has traction motor 6, each has a 32426 bearing. The traditional method of repair is whether the bearing is good or bad. All replaced. According to the survey, about 50% of the bearings replaced each year can be used normally. About every year?