青书学堂: (单选题) 图示均质等截面直杆， 质量为 m ，长为 l, 已知 ， 则 的计算公式为
。
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。
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举一反三
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- 青书学堂: (单选题) https://s3.cn-north-1.amazonaws.com.cn/qingshuxuetang/staticQuestionImg/c9c6484f-046d-4610-aa45-bca1f932daed.jpg
- 青书学堂: https://s3.cn-north-1.amazonaws.com.cn/qingshuxuetang/staticQuestionImg/2dbf1945-c808-4353-9a21-f9f12909aa8a.jpg
- 青书学堂: (单选题) 图示应力状态，其主应力有何特点( ) https://s3.cn-north-1.amazonaws.com.cn/qingshuxuetang/staticQuestionImg/4431bd74-dfdc-47d8-b179-e8f0079b2a62.gif
- 青书学堂: (单选题) 图示应力状态，其主应力有何特点( ) https://s3.cn-north-1.amazonaws.com.cn/qingshuxuetang/staticQuestionImg/4431bd74-dfdc-47d8-b179-e8f0079b2a62.gif