编解码器允许播放不同格式的音频和视频文件。 Media Player 支持各种编解码器。 大多数都现装即用;可以从 Microsoft Store 安装一些其他编解码器。

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Create a field validation rule. Select the field that you want to validate. On the Table Fields tab, in the Field Validation group, click Validation, and then click Field Validation Rule.. Use the Expression Builder to create the rule. For more information about using the Expression Builder, see the article Use the Expression Builder.. Create a message to display for field input that is not valid

选择“同步”选项卡，然后检查“自动同步笔记本”旁边的框。 手动同步笔记本： 选择“ 文件”菜单，然后在“ 信息”选项卡上，选择“ 查看同步状态”。 在显示的“ 共享笔记本同步”对话框中，执行以下操作之一： 选择“ 全部同步 ”以同步所有共享笔记本。 ...

打印机是许多家庭和工作场所中的基本设备，但在与 Windows 操作系统一起使用时，它们有时会遇到问题。 本文介绍 Windows 中的常见打印机问题，包括找不到打印机、打印作业停滞在队列中、打印机后台处理程序崩溃等，以及针对每个问题的分步故障排除解决方案。

Record a macro . On the Developer tab, click Record Macro.. Optionally, enter a name for the macro in the Macro name box, enter a shortcut key in the Shortcut key box, and a description in the Description box, and then click OK to start recording.. Perform the actions you want to automate, such as entering boilerplate text or filling down a column of data.

培训：在 Microsoft 365 中开始使用 SharePoint。 在 office.com，登录到 SharePoint，然后选择 SharePoint 磁贴。

PowerPoint 2021 for Windows lets you create compelling content with the addition of features including co-authoring, Ink Replay, improved slide show recording, new stock media from the Office Premium Creative Content collection and new Draw tab additions such as Point Eraser, Ruler, and Lasso.

注意: 还可以通过选择 开始 > 设置 > 更新和安全 > Windows 安全 > 设备安全，然后在 核心隔离下选择 核心隔离详细信息。. 尽管驱动程序存在阻止其加载的小漏洞，但这很可能并没有任何恶意。 通知中显示的驱动程序名称和公司名称是我们能够收集的有关该驱动程序的唯一可靠信息。

The COUNT function counts the number of cells that contain numbers, and counts numbers within the list of arguments. Use the COUNT function to get the number of entries in a number field that is in a range or array of numbers. For example, you can enter the following formula to count the numbers in the range A1:A20: =COUNT(A1:A20).In this example, if five of the cells in the range contain ...