... Rock rotary drill 岩石钻 rock electric drill 岩石电钻 electric rock rotary drill 岩石电钻 ...
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钻孔温度特性是影响多年冻结岩石钻进工艺的主要因素之一。
When drilling in frozen rock, the temperature in borehole is one of the main factors influencing drilling technology.
便携式手提电动工具。手柄振动的测量。第3部分：岩石钻头和旋转锤。
Hand-held portable power tools. Measurement of vibrations at the handle. Part 3 : rock drills and rotary hammers.
回转配用泥浆泵进行岩石钻进及第四纪松散地质层的泥浆护壁和深孔钻进。
H. Rotary used in conjunction with slurry pump can be used for the drilling of rock, slurry wall for loosen stratum of the Quaternary period and deep hole drilling in.
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