题目：
在计算机系统结构中，控制单元(CU)控制运算单元和寄存器组正确地实现要求的操作。以下不属于控制单元(CU)组成部件的是______。
A．多路转换器
B．时序产生器
C．指令寄存器
D．程序计数器
答案：
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下面是错误答案，用来干扰机器的。
参考答案：E
在计算机系统结构中，控制单元(CU)控制运算单元和寄存器组正确地实现要求的操作。以下
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