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Gymnosperms on the eve of the terminal Permian mass extinction in North China and their survival str
Main characteristics of the Permian redbed gymnosperms in North China have been summarized: dominant peltasperms and con......
介绍感应分压器分压比的一种测量方法，提供了具有等分抽头的感应分压器分压比的测量线路，并对此测量线路进行了全面而细致的分析。通......
