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【单选题】
直径为D的实心圆轴,两端所受的外力偶的力偶矩为m,轴的横截面上最大剪应力是τ。若轴的直径变为0.5D,则轴的横截面上最大剪应力应是( )A.
16 τ
B.
8 τ
C.
4 τ
D.
2 τ
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