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【单选题】
小车以速度 v 沿直线运动,车上一轮以角速度 w 转动,若以轮缘上一点 M 为动点,车厢为动系,则 M 点的科氏加速度的大小为A.
2ωv；
B.
2 ω v cosα;
C.
0;
D.
根据现有条件无法确定。
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