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29. 下面正确的表述是( )。

单选题
2021-09-01 19:09
A、质点作圆周运动,加速度一定与速度垂直
B、物体作直线运动,法向加速度必为零
C、轨道最弯处,法向加速度最大
D、某时刻的速率为零,切向加速度必为零
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正确答案
B

试题解析

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