“古代北京城水利”的概念、定义、翻译、参考文献-科学参考

单词	古代北京城水利
释义	古代北京城水利 Encyclopedia 工学〔中国古代城市水利〕释 water conservancy of ancient Beijing city古代北京城水利北京位于永定河与潮白河洪积冲积扇脊部，这两条河都距城区较远流过，引用存在许多困难。北京降水量年内分布很不均匀，总径流量偏少，自古就是缺水地区。开发利用永定河与潮白河水资源并防止其洪水灾害，是古代北京城水利的重点。
随便看	Diffie Hellmann key exchange protocol Diffie-Hellmann key exchange protocol Diffie Hellman problem Diffie-Hellman problem diffluence difform diffract diffracted wave diffraction diffraction angle diffraction by a circular aperture diffraction by a rectangular aperture diffraction contrast diffraction direction diffraction disk diffraction efficiency diffraction factor diffraction filter diffraction-free beam diffraction fringe diffraction generator diffraction grating diffraction grating alignment measure diffraction group diffraction halo

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