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[期刊论文] 作者：Zhikun Bai,
来源：当代教育研究(百图) 年份：2020
With the development of social science and technology,digital technology has been widely used in all walks of life.Especially in the field of medical education,...
First Record of Petalodus Owen,1840(Chondrichthyes,Petalodontidae)in the Lower Permian(Cisuralian)of
[期刊论文] 作者：GAI Zhikun,BAI Zhijun,LIN Xianghong,MENG Xinyuan,ZHANG Junwen,
来源：地质学报:英文版 年份：2021
The Petalodontiformes are a small intriguing group of Permo–Carboniferous chondrichthyans.Petalodus is the longest known petalodont genus generally considered representative of the order.The first definite fossil record of seven well-prese......
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