顶板走向钻孔
roof drills along strike
Borehole along roof strike
roof strike drills
电子束钻孔机
electron-beam drilling machine
第四系钻孔柱状图
Borehole Log of the Quaternary System
第四纪标准钻孔
standard well for Quaternary research
地浸钻孔
in-situ leaching boreholes
drill hole for in-situ leaching
单钻孔引流术
Single burr-hole irrigation and drainage
单钻孔技术
borehole technology single
798 Artistic Zone
单钻孔机床
single-drilling machine tool