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问题：
[单选题]下面有关计算机操作系统的叙述中,不正确的是______。
A、操作系统属于系统软件
B、操作系统只负责管理内存储器,而不负责管理外存储器
C、UNIX是一种操作系统
D、计算机的处理器、内存等硬件资源也由操作系统管理
参考答案：
B
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