单项选择题
A.便于运算 B.多此一举 C.使数的浮点表示是唯一的 D.使长度最短
A.01001011B B.01010011B C.01010110B D.01110111B
A.11001011B B.11010011B C.11010110B D.11110111B
A.11001011B B.11010011B C.11010010B D.11110111B
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