“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。
随便看	commutation relation commutation relationships commutation station commutation switch commutation theorem commutative commutative A-algebra commutative algebra commutative-associative ring commutative Banach algebra commutative band commutative binary composition commutative center commutative cochain commutative composition commutative convergence commutative diagram commutative elements commutative extension commutative field commutative graded algebra commutative group commutative group object commutative groupoid commutative group scheme

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