drift exploration
勘探巷道 exploring openings ; prospecting drift ; prospect entry ; prospect opening
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本文根据岩溶区勘探钻孔和矿山巷道资料说明河谷深部溶洞分布的成层性。
This paper deals with the phenomenon of layering in the distribution of deep karsts according to the information from the prospecting boreholes and mining excavation in karst areas.
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