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1.main water conveyance tunnel of Dahuofang reservoir is 85.4Km long and threads through Archaeozoic compositing gneiss, Paleozoic quartzite and marble, Mesozoic volcano,lava,volcanic breccia,tuff , sand-shale stone and Yanshan period orthophyre.
大伙房水库输水工程隧道主洞线长85.4km,穿越的地层有太古界混合片麻岩; 元古界石英岩、大理岩;收藏指正
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