mud jack是什么意思

用法例句

During the drilling operation,the valve seat conical hole in high pressure mud pump head is always in a high pressure condition thus caused it easy to wear and tear.

在钻探施工中高压泥浆泵头内瓦尔座锥孔一直处于高压状态,易于磨损,采用镗孔镶锥套方法修复,寿命短,精度也难以达到要求。