“three-level preservation System”的概念、定义、翻译、参考文献-科学参考

单词	three-level preservation System
释义	three-level preservation System Encyclopedia 管理学三线典藏制释 three-level preservation System三线典藏制图书馆按照馆藏文献利用率高低及新旧程度，结合服务方式，将馆藏资源依次划分为三个层次，组成一、二、三线书库的藏书布局方法。
随便看	integral current integral curvature integral curve integral cyclic cohomology group integral density integral density of states integral dependence integral-differential equation integral-differential operator integral direct sum integral divisor integral domain integral drawing integral element integral element over R integral equation integral equation method integral equation Neumann series integral equation of convolution type integral equation of Fredholm type integral equation of Volterra type integral equation theory integral erection method integral exponent integral exponential function

科学参考收录了854744条科技类词条，基本涵盖了常见科技类参考文献及英语词汇的翻译，是科学学习和研究的有利工具。