“percussion drill”簡單造句，percussion drill造句子

Guiding parts, mandrels, calibration rolls, knives, plate cutters, inserts for percussion drills, masonry drill tips, calibration bushes, drawing cheeks, shearing knives, inserts for golfer shoes.

Introducing into air drilling, nitrogen drilling and air percussion drilling were applied in Puguang upper continental facies stratum; moreover, drilled successfully into Xujiahe group stratum.