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我厂在制造液压元件中需要大量钻孔,化费很多工时,为提高生产效率,工人师付革新出同步偏心无齿多头钻(见附图)。图示为四
I plant in the manufacture of hydraulic components require a lot of drilling, the cost of a lot of man-hours, in order to improve production efficiency, workers to pay to innovate out of sync eccentric toothless drill (see photo). The illustration is four