单项选择题
A.01010100 B.11010100 C.00101011 D.10101011
A.01001000 B.11001000 C.+11001000 D.-1001000
A.-1111011B B.+1011011B C.11011011B D.01011011B
A.1011011B B.01111011B C.11011011B D.+1011011B
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