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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.　　蒂姆·艾伦扮演一个身材走形、能力变弱的昔日超级英雄，不情愿地被召回负责教育一群还未挖掘出潜在超能力的少年，好接班承担拯救地球任务。At the beginning, No one has linked these big wasps to the Vietnamese army. However, everyone knows that it is definitely not a good thing for this kind of thing to fly over. I also don't know who it is. I shouted a "fight" at the top of my voice. This loud cry is called a big one. I can actually hear it very clearly through the interference of the "buzzing" sound. Afterwards, I am still thinking, if there is no "buzzing" sound of these big wasps, how loud is this person's voice? I'm afraid the loudspeakers can't compare with them.蒯彻说道：这事情太突然了，其中会不会有诈？会不会是汉国变相地请我们出兵帮忙呢？韩信点头道：从情理上看确实有可能。The best way to conform to the opening and closing principle is to provide an inherent interface, and then let all classes that may change implement the interface, allowing fixed interfaces to interact with related objects.(1) Characteristics, efficiency and limitations of radar;