“pre-Lopingian crisis”的概念、定义、翻译、参考文献-科学参考

单词	pre-Lopingian crisis
释义	pre-Lopingian crisis Encyclopedia 理学前乐平世事件释 pre-Lopingian crisis;end-Guadalupian extinction前乐平世事件发生在二叠纪晚期约2.6亿年以前的生物灭绝事件。又称瓜达鲁普世末灭绝事件。
随便看	positive definite tensor positive definte rational fanction positive deviation positive diffeomorphism positive diffeomorphisms positive differential positive direction positive displacement compressor positive displacement flowmeter positive displacement motor drill positive displacement pump positive displacement sensor positive distinctiveness positive distribution positive divisor positive divisorial ideal positive domain positive drawing positive drive lift positive dromotropic action positive edge positive effect of organizational communication positive eigenvalue positive eigenvalued matrix positive eigenvector

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