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2. Rock drill: used to drill holes with a diameter of 20 ~ 100 mm and a depth of less than 20 meters in rocks above medium and hard. According to its different power can be divided into pneumatic, internal combustion, hydraulic and electric rock drill, of which pneumatic rock drill is the most widely used.
4, the selection of rolling drag plate, the track is not easy to wear.
4, the selection of rolling drag plate, the track is not easy to wear.