当圆截面梁的直径增加一倍时,梁的强度为原梁的______倍,梁的刚度为原梁的__

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问题 当圆截面梁的直径增加一倍时,梁的强度为原梁的______倍,梁的刚度为原梁的______倍。(  )

选项 A.16,16B.8,8C.16,8D.8,16

答案D

解析[img]/upload/tiku/36/5277440_1.jpg[/img]
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