河南宝泉电站引水洞Ⅳ~Ⅴ类围岩开挖
하남보천전참인수동Ⅳ~Ⅴ류위암개알
Type Ⅳ-Ⅴ surrounding rock excavation of water diversion tunnel of Baoquan hydropower station in Henan province
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