The impact hammer of a hydraulic rock drill is a mechanism with high pressure and high frequency.Its seal performances affect the efficient,energy consumption and steadiness of the rock drill.是什么意思_The impact hammer of a hydraulic rock drill is a mechanism with high pressure and high frequency.Its seal performances affect the efficient,energy consumption and steadiness of the rock drill.在線(xiàn)翻譯_英語(yǔ)_讀音_用法_例句