题目内容

【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.