“Cretaceous Period”的概念、定义、翻译、参考文献-科学参考

单词	Cretaceous Period
释义	Cretaceous Period Encyclopedia 理学中生代释 Cretaceous Period白垩纪中生代最后一个纪（第三个纪）。约开始于1.37亿年前，结束于0.65亿年前。白垩纪形成的地层称白垩系（Cretaceous System）。
随便看	center of figure center of force center of gravity Center of gravity method for facility location center of gyration center of homology center of inertia center of inflection center of interest center of inversion center of involution Center of land center of light center of magnitude center of mass center of mass angle center of mass coordinate system center-of-mass coordinate system center-of-mass energy center of masses center of mass frame center-of-mass frame center of moment center-of-momentum frame center of momentum system

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