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便携式手持动力工具。手柄部位振动量的测量。第7部分：具有冲击，冲力和棘轮传动动作的扳手，螺锥和螺母拧紧器。
Hand - held portable power tools. measurement of vibrations at the handle. part 7: wrenches, screwdrivers and nut runners with impact, impulse or ratchet action.
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