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                题目内容
                (川北医学院口腔医学院)
            
            
                图示简支梁中间截面的弯矩为( )
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·<img src="https://s3.cn-north-1.amazonaws.com.cn/qingshuxuetang/examination/imgUplod/1701141266176402d9ac99b5542098903f2eef143eb78image5.png" 2.
                参考答案