【单选题】【消耗次数:1】
Windows 7 是一种( )的操作系统
单任务
单用户
单用户/多任务
网络
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相关题目
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①  正确
②  错误
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①  as
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①  which
②  that
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①  that
②  how
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②  the
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①  stand
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①  or
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