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电动三轮车载货爬坡无力加力档不起作用，可能一颗螺丝引起的故障
电动三轮车在棉花地里泡在水里几天，无法使用加力档。本来想拆开给大家再次学习一下牙包的拆装技巧的，结果是小问题！如果不想拆牙包，直接拆装拉杆螺丝即可！
电动车典型故障维修41/71
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