Hand-held portable power tools. Measurement of vibrations at the handle. Part 7: wrenches, screwdrivers and nut runners with impact, impulse or ratchet action.是什么意思_Hand-held portable power tools. Measurement of vibrations at the handle. Part 7: wrenches, screwdrivers and nut runners with impact, impulse or ratchet action.在线翻译_英语_读音_用法_例句