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The design of low carbon tourism could reduce the cost of tourism and improve the comfort of tourism, and also could ach......
为了制备无砷红外硫系光纤,采用熔融-淬冷法和蒸馏提纯工艺熔制了高纯度的Ge20Se79Te1和Ge20Se80两种玻璃,基于优化的掏心挤压法制......
目的基于卫生经济学理论，探讨饮水型氟斑牙患病率的影响因素。方法收集2005 - 2015年我国26省（市、自治区）饮水型地方性氟中毒（简称地......
