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某一类群生物在其大规模繁盛之前就已经出现的少数代表。生命宏演化进程中分类单元的一种形式,它们往往拥有特殊的演化新质,能够突破重大灾变的冲击而幸存下来并进一步发展、壮大。
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database design method
database design tools
database development and applied management system of museum collection restoration
database development and applied management system of museum collection storage
database development and applied management system of museum fixed assets
database development and applied management system of museum office automation
database development system of visitor or user' personalized need analysis and collection
database dump
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database for urban survey
database-guided design
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