题目内容

半导体存储器按功能可分为和两种类型，其中在电源掉电后信息不会丢失。

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ROM和RAM的主要区别是什么？它们各适用于哪些场合？

Listen to the recording and choose the correct number according to what you have heard.[音频]Q: How many cups does the speaker need 1

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