The overexploitation of the natural environment caused by urbanization makes more and more natural and semi-natural plan......

With the methods of regression analysis and trend surface analysis, taking the bottom and top lines of dark conifer fore......

氟中毒严重危害人体健康，是世界上主要地方病之一。它与饮水关系密切。因此，本文探讨了氟在自然界的富集规律，对寻找天然低氟水源，改善......

豫西一带含煤地层中的滑动构造相对发育。滑动构造引起煤层顶底板附近岩石力学性质发生变化，进而影响岩体的分带性。从研究嵩山井田......