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【单选题】
对于沿曲线运动的物体,以下几种说法中正确的是( )。
A.
切向加速度必不为零
B.
法向加速度必不为零（拐点处除外）
C.
由于速度沿切线方向，法向分速度必为零，因此法向加速度必为零
D.
若物体作匀速率运动，其总加速度必为零
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【单选题】随行就市定价法属于哪种导向的定价方法 ( )
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