["..3√Dd....33
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选择题：直径为d 的实心圆轴受扭，在扭矩不变的情况下，为使扭转最大切应力减小一半，圆轴的直径应改为（ ） 。 A.2d B.0.5d C.√2d D.3√2d 答案：D 提示：能阐述出解题过程的给予额外奖励，答案回复可见！
本帖最后由 中原人 于 2020-3-29 18:08 编辑 D.3√2d 分析： 抗扭截面系数 【解析】设改变后圆轴的直径为，则， 解得：
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