维护界面具有添加、删除、修改等功能，出卷界面分为自动出卷界面和组卷界面。
Maintain interface include add, delete, alter etc. Export exam interface include auto export exam and export exam by hand.
如果这个整数非0，那么它就是一个会话id，并且使用标记有url的会话id，用户被重定向到账号维护界面。
If this integer is non-zero, it is a session ID and the user is redirected to the account maintenance screen with the session ID tagged on to the URL.
从用户界面和维护的角度来看，采用一个含少量排序箭头的视图比采用包含多个排序箭头的视图要好。
From a user interface and maintenance perspective, it's better to have a single view with a handful of sorting arrows than multiple views.
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