李振兴

Updated 教师偏好设置接口 (markdown)

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####返回值
######设置成功
> 状态码:200
```json
{
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}
```
######设置失败情况1
> 状态码:400
```json
"preference_setting_failed": "难度未选择"
```
######设置失败情况2
> 状态码:400
```json
"preference_setting_failed": "适合年级未选择"
```
######设置失败情况3
> 状态码:500
```json
"preference_setting_failed": "其他异常"
... ...