单项选择题
A.01111010 B.11111010 C.+1111010 D.-1111010
A.-1011001B B.+1011011B C.11011011B D.01011011B
A.1011011B B.01011001B C.11011011B D.+1011011B
A.01100110 B.00010001 C.10011001 D.10001000
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