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中国地质科学院岩溶地质研究所朱学稳教授等人,在广西巴马瑶族自治县甲篆乡的峰丛洼地中,发现两个特大的岩溶天坑号龙天坑和交乐天坑。岩溶天坑也称“喀斯特天坑”。号龙天坑的口径东西长约800米,南北宽约600米,最大深度为509.3米,总容量为1.137亿立方米。在我国已发现的岩溶天
Chinese Academy of Geological Sciences, Institute of Karst Geology, Professor Zhu Xuewen and others, in Bama Yao Autonomous County of Guangxi Zhuantao peak cluster depression, found two large karst tiankeng Long Tiankeng and music Tiankeng. Karst tiankeng also called “Karst tiankeng”. Longtongkeng diameter of about 800 meters east-west, north-south width of 600 meters, the maximum depth of 509.3 meters, with a total capacity of 113.7 million cubic meters. Karst days that have been found in our country