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【单选题】
做圆周运动的物体 ( )
A.
加速度的方向必定指向圆心
B.
切向加速度必定等于零
C.
法向加速度必定等于零
D.
合加速度必定不等于零
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【简答题】拍照上传已做好没批阅的作业
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【单选题】Professor Deiner has spent many years studying_______in happiness.
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