“古代黄河防汛”的概念、定义、翻译、参考文献-科学参考

单词	古代黄河防汛
释义	古代黄河防汛 Encyclopedia 工学中国防洪史释 flood control of the Yellow River in ancient China古代黄河防汛古代黄河防汛的方法、制度及其实践，包括对汛水的认识、报汛、汛地值守等环节，以及有关规章。
随便看	proper maintenance method of photographic lens proper map proper mapping proper mass proper modification proper morphism proper motion proper motion group proper motion in declination proper motion in right ascension proper motion member proper motion membership proper motion star proper name proper name of a function proper natural number proper nilpotent element proper node proper non-inferior solution proper nonvoid subset proper number proper open covering proper order dictionary proper orthochronous Lorentz group proper orthogonal group

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