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【单选题】
在计算机语言中有一种逻辑运算，如果两个数同一位上都是O时，其和为O；一个为0、一个为1两个都是1时，其和为l。那么（ ）。
A.
如果和为1，则两数必然都是1
B.
如果和为0，则两数必然O
C.
如果和为0，则两数中可能有一个为1
D.
如果和为1，则两数中至少有一个为O
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