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【单选题】
一质点从静止出发沿半径 2 m 的圆周运动,其角加速度随时间 t 的变化规律是 β=12 -6 t (SI) , 则t=2s时质点的 切向加速 度 a t =( )
A.
72
B.
64
C.
60
D.
70
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