Computer systems consist of two very different types of elements: Hardware, whic
Computer systems consist of two very different types of elements: Hardware, which includes all the physical things that can be touched and(71)which tells the hardware how to do.
A．Operating system
B．I/O devices
C．Courseware
D．Software
正确答案：D解析：计算机系统由两种完全不同类型的部分组成：硬件(我们能触摸到的所有物体)和软件(告诉硬件怎样做)。
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