【单选题】【消耗次数：1】
在文字样式中，点击删除无法删除某个样式，原因是（）。
①
正在使用的样式
②
系统默认样式，不可以删除
③
样式都是不可以删除的
④
删除按钮为灰色，无法操作
参考答案：
复制
纠错
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在Windows 7中使用删除命令删除硬盘中的文件后，（ ）
①
文件确实被删除，无法恢复
②
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③
文件被放入回收站，可以通过“查看”菜单的“刷新”命令恢复
④
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