Александра Лисица (Редактор отдела «Забота о себе»)
This formula is satisfiable because if we set to b to true and a to false, then the whole formula is true. All other assignments make the formula false, but it doesn't change that the formula is satisfiable as long as there is at least one assignment makes the formula true.，更多细节参见搜狗输入法下载
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根據美國汽車協會（American Automobile Association）提供的資料，截至2月24日，美國全國每加侖汽油的平均價格為2.95美元。，详情可参考爱思助手下载最新版本
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