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问题：
[单选题]ROM与RAM的主要区别是_____。
A、断电后，ROM内保存的信息会丢失，RAM则可以长期保存不会丢失
B、断电后，RAM内保存的信息会丢失，ROM则可以长期保存不会丢失
C、ROM是外存储器，RAM是内存储器
D、ROM是内存储器，RAM是外存储器
参考答案：
B
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