【单选题】 The( )is a computer subsystem that performs operations on data.
A. CPU
B. memory
C. I/O hardware
D. none of the above
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【单选题】 The data in( )are erased if the computer is powered down.
A. RAM
B. ROM
C. a tape drive
D. a CD-ROM
【单选题】 The( )memory consists a copy of a portion of main memory.
A. CPU
B. cache
C. main
D. ROM
【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.