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单项选择题
下面关于存储器空间映射的说法正确的是？
A、英文可表述为 Memory Map
B、读写外部设备与读写存储器单元有类似的机制，共用同一套指令集
C、读写外部设备与读写存储器不同，各有自己的指令集
D、采用存储器空间映射机制的处理器，其片内外设模块的访问地址可以按需设置
B、读写外部设备与读写存储器单元有类似的机制，共用同一套指令集
C、读写外部设备与读写存储器不同，各有自己的指令集
D、采用存储器空间映射机制的处理器，其片内外设模块的访问地址可以按需设置
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