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3. Physical period: Uniform circular motion is a kind of periodic motion. The so-called periodicity refers to the fact that after a certain period of time, the moving object repeats back to its original position, and the instantaneous speed repeats back to its original size and direction. The time it takes for an object to move in a uniform circle is called a period. The period is expressed by the symbol T, and the period is also a physical quantity describing the speed of uniform circular motion. The long period indicates the slow motion of the object, while the short period indicates the fast motion of the object.栏目通过版面以及动画片、动画电影和节目，丰富同学们和小朋友们的精神生活。Mud-dyeing is above all part of cold dyeing technologies, which greatly reduce the damage done to a fabric's fibers. As a consequence, althoughwe'd been using a considerable amount of cash, there basically was no sign of damage, no floating hair whatsoever; if anything, the fabric was actually fortified.《玛嘉烈与大卫》的故事继续发展之前，先乘坐时光机，回到过去，看看玛嘉烈和大卫在遇上对方之前，爱了什么人、害了什么人、撒过什么谎、躺在谁的怀里...　　这一次，约翰（哈里森•福特Harrison Ford 饰）成为了巴克的新主人，幸运的是，约翰是一个善良的男人，他不仅非常温柔的对待巴克，还治好了它伤痕累累的身体。随着时间的推移，一人一狗之间产生了坚实的友谊。然而，在一场意外中，约翰被印第安人杀死了，愤怒的巴克失去了理智，它要为自己的主人报仇。“如果我是你合适人选，那么从现在开始，你不能对我说不。”从朋友到爱人。当一个是好人，而另一个是坏男孩时，这种关系会如何发展？有没有可能把坏男孩变成恋人？《税务所的故事》以北京某地一个城乡结合部一个小税务所为背景，通过以老陈为首的五名税务干部的日常工作和生活，展现当代生活的多彩画面，折射出税务干部和各色各样的纳税人的人生百态、苦乐悲欢。