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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.ps：最后一天了，看在原野更新勤奋的份上，咱把新书粉红位置往前挪几名好么？另，每一章的标题太难拟了，以后我就不限字数，随便拟了。女大学生南多情（金素恩 饰）的家境并不富裕，父亲更是因为负债累累无力偿还而选择了抛弃女儿远走高飞。然而，南多情的个性生来善良而单纯，总是轻易无条件的相信她人，想不到这样的性格竟让将她在姜道荣（申盛禄饰）的设计之下卷入了一个万劫不复的欺诈游戏之中。崇焕、光斗、进忠无奈地以现代人的身分重新展开人生，但他们终究是明朝古人，虽然他们一个武功精湛、一个智慧机灵、一个厨艺出众，但老套的价值观、对科技知识的一窍不通，令他们与现代人的生活格格不入，也因此闹出不少笑话!在陈启原来的那个世界，网络文学发展了好几年，才出现了第一个千万盟。For example, the average monthly living expenses of the lowest income group in a certain area are 210 yuan, the maintenance coefficient of each employed person is 1.87, the minimum food cost is 127 yuan, Engel's coefficient is 0.604, and the average wage is 900 yuan.我帮你弄弄？徐风抬手但没敢碰。