题目内容

能正确表示a和b同时为正或同时为负（排除0）的逻辑表达式是（）。

A. (a>=0||b>=0)&&(a<0||b<0)
B. (a> 0&&b> 0)||(a<0&&b<0)
C. (a+b>0)&&(a+b<=0)
D. a*b>0

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