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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.It has projection equipment and radiation image playing equipment, including retrospective playing of historical image data;　　《格林 Grimm》男主David G iuntoli饰演Eddie，他曾经是当地乐队的主唱歌手，后来当了音乐教师及家庭主夫；尽管Eddie热爱当父亲，不过他的婚姻陷入了危机中，而Eddie不禁在想如果他作出不一样的抉择，人生会有甚么变化。Romany Malco饰演Rome，一个郁郁寡欢但事业有成的广告导演，他自问去电影学院学习，不仅仅为了「让广告中披萨看起来更可口」这种层次的事﹑Christina Moses饰演具才华的厨师Regina Howard，她梦想开自己的餐厅，她与丈夫Rome的关系因后者的抑郁症而紧张。Yishang was rushed to the hospital, and the policemen ran to the hospital in panic when they learned of it. Yu Ying, who heard the news of Yishang from Fu Ying, finally couldn't help running to find Yishang. Kezi, who has more and more doubts about Qinglan, told his health. Yu Ying hid the flight time from Fan Ren and left home for the airport early in the morning when the patrol called to see her. Xuancha and Yeon-hee came to the seaside to relax. In the distance, the small rate saw the intimacy of the two people.B women's 4 still water events: 500m single kayak, 500m double kayak and 500m four kayak; Jet Roundabout: Single Kayak.2.5. 3.1 General requirements for opening V-grooves