问题：
[单选题]计算机系统中的硬件系统包括主机和外设。下面关于主机和外设错误的说法是______。
A、计算机的输入、输出及外存储设备合称为外部设备
B、运算器和控制器合称为CPU
C、内存及外存常常都装在主机箱内，因此它们都属于主机的构成部分
D、中央处理器和内存储器合称主机
参考答案：
C
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