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　　终於，有一天......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.一望无际的农场上空，农作物喷粉机尘土一心想走入竞赛会场。平日里他的好友农药喷洒车查克担任教练和技师职务，尘土则不顾自身条件在农场附近急速飞行，为此没少受修理车多蒂的臭骂，可他还是毅然报名参加了机翼环球赛的预选赛。尘土极其幸运地通过预选，却也意识到自己和专业赛用飞机的差距，因此拜托传说中曾击落50架敌机的退役战机船长担任他的教练。虽然恐高症始终无法克服，不过尘土总算如愿站在大赛的起跑线上。6. Internet access rate: To ensure stable Internet connection, the lowest connection rate is above 56kbps (using Modem dialing), and above 512kbps (using ADSL or broadband access) is recommended.Limit 15 and its accessories