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【单选题】
在计算机系统中总线宽度分为地址总线宽度和数据总线宽度。若计算机中地址总线的宽度为 32 位 , 则最多允许直接访问主存储器的物理空间是 ( ) 。A.
40MB
B.
4GB
C.
400GB
D.
40GB
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A.
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B.
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C.
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D.
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