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问题：
[单选题]Windows 的"系统工具"主要有__
A、磁盘压缩程序、磁盘修复程序、PCTOOLS等
B、ARJ压缩程序、BACKUP\RESTORE命令、PCTOOLS命令等
C、传真程序、备份工具、磁盘管理工具等
D、备份、磁盘清理、磁盘碎片整理程序等
参考答案：
D
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