oil-hole drill

• 油孔钻头,油孔钻

oil-hole drill的用法和样例：

例句

1. The life of the drill and the location accuracy of entering drilling of microvoid are remarkably impr.
   分析了微小孔钻头轴向振动入钻时特殊的动力学行为及其对入钻定位误差的修正作用。