n. 计数器（四则计算机）
1.Control unit (controller) : control unit is composed of program arithmometer, instruction register and operation controller, ect.
控制器：控制器是由程序计数器、指令存放器跟操作控制器等组成。
2.Control unit (controller) : control unit is composed of program arithmometer, instruction register and operation controller, ect.
控制器：控制器是由程序计数器、指令存放器跟操作控制器等组成。