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【单选题】
某刚体绕定轴作匀变速转动，对刚体上距转轴为处的的法向加速度【图片】和切向加速度【图片】来说正确的是（ ）．A.
、 的大小均随时间变化；
B.
、 的大小均保持不变；
C.
的大小变化， 的大小保持恒定；
D.
的大小保持恒定， 的大小变化．
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