将打印机设置为默认打印机后，打印机图标旁边将出现一个复选标记。
After you set a printer as the default printer, a check mark appears next to the printer icon.
控制字是一种特殊的RTF用来标记打印机控制符的格式化命令，也是程序用来管理文档样式的格式化信息。
A control word is a specially formatted command that RTF USES to mark printer control codes and information that applications use to manage documents.
如果打印机图标旁边显示复选标记，则说明该打印机是您的默认打印机。
If you see a check mark next to the printer icon, the printer is your default printer.
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