谁知道在方向键上面的九个键是干什么的

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[复制屏幕到剪切版] [滚动锁定] [暂停] => 后面两个是DOS时代使用的
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page up是首页,page down是尾页
delete是删除光标后的字符．

有上下页，截屏，文档开始，文档结尾，插入，删除，键盘锁