percussive machine drilling

常見例句

雙語例句

• Researches indicate that the new type of DTH hammer without drilling machine can make DTH hammer achieve percussive and rotary drilling using air compressor.
  借鑒鑿巖機(jī)的轉(zhuǎn)釬機(jī)構(gòu)，利用活塞的回程能量帶動(dòng)鉆頭旋轉(zhuǎn)。
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