单选题：下面关于随机存取存储器(RAM)的叙述中，正确的是（　　）。

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题目内容：
下面关于随机存取存储器(RAM)的叙述中，正确的是（　　）。 A．存储在SRAM或DRAM中的数据在断电后将全部丢失且无法恢复
B．SRAM的集成度比DRAM高
C．DRAM的存取速度比SRAM快
D．DRAM常用来做Cache用

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