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【单选题】
下列关于内存和外存的叙述,错误的是 _____。(2012-3)A.
断电后存放在外存中的信息不会丢失，可以长期保存
B.
外存的容量比内存大的多，甚至可以说是的
C.
外存速度慢，内存速度快
D.
内存和外存都是由半导体器件构成的。
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