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.
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，这一点在旺商聊官方下载中也有详细论述
第一节 扰乱公共秩序的行为和处罚。关于这个话题，爱思助手下载最新版本提供了深入分析
He had persuaded his science teacher to help him make a makeshift rocket. Somehow, he had managed to get his hands on the ingredients for gunpowder - potassium nitrate, sulphur and charcoal.，更多细节参见旺商聊官方下载