单选题:组成一个完整的计算机系统应该包括(  )。

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题目内容:
组成一个完整的计算机系统应该包括(  )。 A.主机、鼠标器、键盘和显示器
B.系统软件和应用软件
C.主机、显示器、键盘和音箱等外部设备
D.硬件系统和软件系统

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