单项选择题
A.01000001 B.11000001 C.10111110 D.10111111
A.00100001 B.01011110 C.01011111 D.10100001
A.20B.40C.80D.100
A.5×1000×1000 B.5×1000×1024 C.5×1024×1000 D.5×1024×1024
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