borehole technology dual
井下热交换器技术 borehole technology downhole heat exchanger 双钻孔技术 borehole technology dual 多钻孔技术 borehole technology multi ..
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采用井下仰斜钻孔双端堵水器导高观测技术对白庄煤矿综放开采条件下，覆岩破坏规律进行了实测，得出了导水断裂带的发育高度。
Adopting survey technology of double-head water-stopped machine flowing high of upward-inclined drillhole rock destruction rules were surveyed, development height of water conducted zone was gained.
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