磨刀砂巖 的英文怎麼說
中文拼音 [módāoshāyán]
磨刀砂巖
英文
farewell rock-
Drill efficiency could be promoted sharply in penetration of high - medium hard sand rock rock formation. its wings are of higher wear resistance and impact efficiency. to repeat repair grind are not necessary
大幅提高中硬巖層砂巖的鉆進效率,刀翼耐磨抗沖擊性強,不需反復修磨,鉆頭壽命長。
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