一质点做半径为 R 的圆周运动,其路程 S 随时间 t 变化的规律为 , 式中 b 、 c 为大于零的常量 , 则此质点运动的切向加速度 = ( );法向加速度 =( )。
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举一反三
【单选题】Suppose you are Lita, finish the following questions. [音频] (表格第4题) If you were buying furniture for your room, which of the following words would best describe the kind of things you would choose?