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绘制图示结构的弯矩图，弯矩图正确的是（ ）
<img alt="" height="114" src="https://lms.ouchn.cn:443/api/uploads/733530/in-rich-contentcreated_at=1628846728" width="203">(单选题)
.<img alt="" height="102" src="https://lms.ouchn.cn:443/api/uploads/733531/in-rich-contentcreated_at=1628846728" width="194">
.<img alt="" height="102" src="https://lms.ouchn.cn:443/api/uploads/733532/in-rich-contentcreated_at=1628846728" width="194">
.<img alt="" height="102" src="https://lms.ouchn.cn:443/api/uploads/733533/in-rich-contentcreated_at=1628846728" width="194">
.<img alt="" height="102" src="https://lms.ouchn.cn:443/api/uploads/733534/in-rich-contentcreated_at=1628846728" width="194">

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出自：2024年国家开放大学答案

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