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在日常设备维修中经常遇到拆卸螺丝或螺母非常费劲,甚至有些螺丝或螺母(例如汽车、摩托车、液压机等一些关键螺丝或螺母)很难拆下来。这是因为当初紧固这些螺丝或螺母的工具是电动改锥或电动
It is very laborious to dismantle the screws or nuts in the daily maintenance of the equipment. Even some screws or nuts (such as the key screws or nuts of automobiles, motorcycles and hydraulic machines) can not be disassembled easily. This is because the tools used to tighten these screws or nuts were electric screwdrivers or electric motors