版本：
文件：
- https://cdn.bootcdn.net/ajax/libs/bootstrap-rtl/3.4.0/css/bootstrap-flipped.css
- https://cdn.bootcdn.net/ajax/libs/bootstrap-rtl/3.4.0/css/bootstrap-flipped.css.map
- https://cdn.bootcdn.net/ajax/libs/bootstrap-rtl/3.4.0/css/bootstrap-flipped.min.css
- https://cdn.bootcdn.net/ajax/libs/bootstrap-rtl/3.4.0/css/bootstrap-rtl.css
- https://cdn.bootcdn.net/ajax/libs/bootstrap-rtl/3.4.0/css/bootstrap-rtl.css.map
- https://cdn.bootcdn.net/ajax/libs/bootstrap-rtl/3.4.0/css/bootstrap-rtl.min.css