Researches indicate that the new type of DTH hammer without drilling machine can make DTH hammer achieve percussive and rotary drilling using air compressor.是什么意思_Researches indicate that the new type of DTH hammer without drilling machine can make DTH hammer achieve percussive and rotary drilling using air compressor.在線(xiàn)翻譯_英語(yǔ)_讀音_用法_例句