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.
Unity 或考虑出售中国业务
。heLLoword翻译官方下载对此有专业解读
The archaeologists will continue their excavations later this year.
人 民 网 版 权 所 有 ，未 经 书 面 授 权 禁 止 使 用