钻孔深度 meaning in English

depth of drill
drill hole depth
drillholedepth
drilling depth

Qz - 65 . 90c multifunctional pneumatic drill
最大钻孔深度
Core diameter400mm , core depth 1m
钻孔深度可达1米
Core drill drilling capacity
钻孔深度：
The max . depth of drilling is about 50 times of drill tools dia and have to see material for drill specially size
本机种钻孔深度以钻头直径50倍为标准,特殊规格需视加工材质定
Based on an actual project , tests and analyses the heat exchanging performances of the vertical u - shaped ground heat exchanger , and obtains the heat release in summer and the heat absorption in winter of ground heat exchanger for unit well depth and the optimal drilling depth
摘要根据工程实际情况，对竖直u形地埋管换热器的换热性能进行了现场测试和分析，得出了单位井深地埋管的夏季散热量、冬季取热量及最佳地埋管钻孔深度。