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【单选题】
当汽车传动轴纯扭转时，关于其横截面上的剪应力分布和方向（）是正确的。
A.
轴心处剪应力最大。
B.
轴的圆周处剪应力为零。
C.
整个截面剪应力大小相等。
D.
剪应力的方向与半径垂直。
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