“water conservancy of ancient Beijing city”的概念、定义、翻译、参考文献-科学参考

单词	water conservancy of ancient Beijing city
释义	water conservancy of ancient Beijing city 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。
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