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【单选题】
下列描述中,正确的是( ).A.
光盘驱动器属于主机,而光盘属于外设
B.
摄像头属于输入设备,而投影仪属于输出设备
C.
U盘即可以用作外存,也可以用作内存
D.
硬盘是辅助存储器,而不属于外设,
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