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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第十条 国家加强原子能领域标准体系建设，推动、参与原子能领域国际标准化活动。。快连下载安装对此有专业解读
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Полина Кислицына (Редактор)