若计算机中地址总线的宽度为24位，则最多允许直接访问主存储器（ ）的物理空间（以字节为单位编址）。
- A.8M
- B.16MB
- C.8GB
- D.16GB
正确答案及解析
正确答案
解析
地址总线决定了寻址的能力，宽度24位，其寻址能力为2^24=2^4*2^20=16M，按字节寻址，空间为：16MB
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