【单选题】 The( )memory consists a copy of a portion of main memory.
A. CPU
B. cache
C. main
D. ROM
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【填空题】The CPU performs operations on data and has an ____, a control unit, and a set of ____.
【填空题】The ____are stand-alone storage devices that hold data temporarily.
【填空题】 Registers can hold____, ____, and also function as a ____.
【填空题】 A ____bus, an ____bus, and a____bus connect the CPU and memory.