1. [第三题.png](https://image.zhihuishu.com/zhs/teacherExam_h5/COMMONUEDITOR/202104/cf647665797246c8b79e5cbf58b3acca.png)![3A.png](https://image.zhihuishu.com/zhs/teacherExam_h5/COMMONUEDITOR/202104/f183e9ef6972482eaffd1c591164005a.png);![3B.png](https://image.zhihuishu.com/zhs/teacherExam_h5/COMMONUEDITOR/202104/6e56960efbed4c69a88a0f4cb95f5367.png);![3C.png](https://image.zhihuishu.com/zhs/teacherExam_h5/COMMONUEDITOR/202104/9c67a153df124fb0974b88b2ebe76f98.png);![3D.png](https://image.zhihuishu.com/zhs/teacherExam_h5/COMMONUEDITOR/202104/88c667d192384162b8f188c3dd7b92ff.png)

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