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反循环双重岩心管是苏联最近试验的一种钻具。这种岩心管适用在严重破碎和裂缝的岩石中钻进。利用它可以比用普通的方法钻进提高岩心采
Reverse circulation double core tube is a kind of drilling tool recently tested by Soviet Union. This core tube is suitable for drilling in severely fractured and fractured rocks. Use it to drill to improve core mining than using normal methods