The permutation of the finite set is introduced into the denumerable set as well as the definition of the basic rotation, the rotation and the composition of the countability.
把有限集中的置换推广到可数集上，引入基轮换、轮换及变换的可数次合成等概念的定义。
The basic features of earth's rotation.
地球自转的基本特点。
This book serves as the basic text for any of the above individuals taking a rotation through a pediatric imaging department and for orienting pediatric personnel within the imaging department.
这本书作为对通过采取儿科影像科一轮换以上的任何个人的基本取向文字和影像科内儿科人员。
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