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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.玄武王重返疆场，又有白虎侯联手，却并未像皇帝和大臣们想的那样，奋起神威，横扫元国，为大靖开疆拓土。1. At the beginning of Apple's establishment, it mainly developed and sold personal computers. As of 2014, it was committed to designing, developing and selling consumer electronics, computer software, online services and personal computers.A inAfter the fracture is cured, the function is normal and qualified. After joint injury or dislocation is cured, there is no recurrence and the function is normal and qualified.香儿笑道：说的我都饿了Then look at the source code of activity's dispatchTouchEvent (), getWindow (). SuperDispatchTouchEvent (ev). This method is the method of Window abstract class class. Everyone knows that the implementation class of Window is PhoneWindow, so directly look at the superDispatchTouchEvent () method of PhoneWindow: