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两栖纲
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两栖纲
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理学
两栖纲(化石)
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两栖纲(化石)
脊椎动物中最早登上陆地的一个门类,其他陆生脊椎动物由它发展而来。包括现生两栖类及其近亲(滑体两栖类)和古生代、中生代的非羊膜类四足动物(即“古代”两栖类)。
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Book
book
book advertisement
book agency in university and college press
Book Aid International
Book Almanac of China
book and newspaper stand
book and periodical information pushing
Book and Sword
book backlog
book-banning case caused by the Poems of Jianghu School
book banning in ancient China
book banning in the Qing Dynasty
book-basking
bookbinding
bookbinding and layout
bookblock processing
book circulation modes
book classification in store
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