产品版本
使用以下宏来显示主题的版本和状态信息：
| 宏 | 展开为 |
|---|---|
| \QtMajorVersion | 基于 $QT_VER 环境变量的主版本号 |
| \QtMinorVersion | 基于 $QT_VER 环境变量的次版本号 |
| \QtVersion | $QT_VERSION 环境变量的值 |
| \QtVer | $QT_VER 环境变量的值 |
| \techpreview | 声明该模块或类为预发布版本，可能会发生变更 |
\techpreview
在简短句子后附加技术预览链接，并将该主题添加到tech_preview 组中。
必须直接置于
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