题目内容
【单选题】 The data in（ ）are erased if the computer is powered down.
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【单选题】 The（ ）memory consists a copy of a portion of main memory.
【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 ____.
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