示例 下面是 Excel 中一些常见的嵌套 IF (AND ) 、IF (OR ) 和 IF (NOT ) 语句的示例。 AND 和 OR 函数最多可支持 255 个单独条件，但并不建议使用多个条件，因为构建、测试和维护复杂的嵌套公式是非常难的。

更改桌面背景图像. 你可以选择桌面背景并随时更改它。. 选择 “开始 > 设置” > “个性化 > 背景 ”。. 在 “个性化设置背景 ”旁边的列表中，选择“ 图片 ”、“ 纯色 ”、“ 幻灯片放映 ”或“ Windows 聚焦 (”，) 查看来自世界各地的新图像。. 注意: 如果无法 ...

Windows 10和Windows 11 (原始) 旨在满足当今组织的复杂且不断发展的需求，提供：. 针对现代安全威胁的高级防护. 灵活的部署、更新和支持选项. 全面的设备和应用管理和控制. 通过帮助简化更新、Windows 10和Windows 11 (原始) ，还可以快速向最终用户提供最新创新 ...

Sign in to Outlook on the web with your work or school account. Go to outlook.office.com. If you're not automatically signed in with your work or school account, follow the prompts to enter the email address and password for your work or school account. Follow any two-factor authentication prompts you may have previously set up for this account.

The new Outlook for Windows brings the latest features, intelligent assisted capabilities and a new modern and simplified design to your Outlook app.

Learn how to update drivers in Windows using Device Manager to update or reinstall a driver.

Find out how to fix sound or audio problems in Windows.

You can choose your desktop background and change it at any time. Select Start > Settings > Personalization > Background. In the list next to Personalize your background, select Picture, Solid color, Slideshow, or Windows Spotlight (to see a new image from around the world every day). Note: If you can't select the Windows Spotlight option, your ...

Windows XP 和 Windows Server 2003. 本文介绍如何获取最新版本的 DirectX 以启用系统上的游戏和多媒体应用程序。.

Learn how to check if your PC is capable of running TPM 2.0 or how to enable TPM 2.0 to upgrade to Windows 11.