单选题:在所列出的:1、字处理软件,2、Linux,3、UNIX,4、学籍管理系统,5、Windows 7和6、Office 2

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在所列出的:1、字处理软件,2、Linux,3、UNIX,4、学籍管理系统,5、Windows 7和6、Office 2010这六个软件中,属于系统软件的有(  )。 A.1,2,3
B.2,3,5
C.1,2,3,5
D.全部都不是

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