Ultra-high pressure jet assisted drilling is an affective approach for improving penetrationspeed; and influential factors and mechanism of rock breakage are key technologies.
超高压水射流辅助破岩是提高机械钻速的有效途径，水射流破岩效果影响因素及机制研究是其关键之一。
2
The forest crown interception precipitation, the penetrationspeed of soil, and the surface runoff of Larix Kaempferi forests in Funiu Mountain in Western Henan Province were measured in this paper.
测定了豫西伏牛山区日本落叶松林的林冠截流降雨、土壤渗透速度和地表径流。
3
It is not surprising then that high-speed Internet penetration rate is below 1 percent in Africa, compared to close to 30 percent in some high-income countries.