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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【图片】。若轴的直径变为0.5D,则轴的横截面上最大剪应力应是 【图片】。
A.
( A ) 16
B.
( B ) 8
C.
( C ) 4
D.
( D ) 2
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A.
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B.
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C.
向内与内耳道相通
D.
为一含气的不规则的腔道
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