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驾驶员李某经营着一台泰山－ 12型小四轮拖拉机。在近一段时间内，该机液压提升机构一工作，变速箱盖就出现裂纹。李某连续 6次更换变速箱盖，到现在都不知道产生“破裂症”的原因。在无可奈何的情况下，李某将车开到乡农机站，请乡农机站的师傅修理。乡农机站的原师傅向李某了
Driver Lee runs a Taishan - 12 small four-wheel tractor. In a recent period of time, the machine hydraulic lifting a work, gearbox cover cracks. Lee 6 consecutive replacement gearbox lid, up to now do not know the cause of “rupture”. In the case of no alternative, Lee will drive to the township farm machine station, please go to the farm machine repair station. Township Agricultural Machinery Station of the original teacher to Lee