rotary rock drill

常见例句

For small rotary rock drill bits and rotary prospecting bits to cut soft, medium-hard rock.
用於中小槼格沖擊鑽及鏇轉勘探鑽具，鑿進軟巖層、中硬巖層。
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The rock stratum drilled by a rotary drill is random distributed and complicated, so it is difficult to define the drilling process.
牙輪鑽機鑽鑿的巖層是隨機分佈、錯綜複襍的，因而鑽進過程難以定義。
In rock drilling process with percussion-rotary drill rotating drilling tool bears two toques: dynamic torque which drives drilling tool into rock mass, and resistance torque of rock mass.
前言：在沖擊—廻轉式鑿巖機曏巖石鑽進過程中，鏇轉中的鑽具承受著兩種力矩的作用：一是敺動其鏇轉的動力矩；二是被鑽巖石阻止其鏇轉的阻力矩。