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.
宜昌古称夷陵，素有“川鄂咽喉”之称，是巴楚文化交融之地，也是蜡梅原产地之一。本土花卉蜡梅见证了“三峡门户”2000多年的传承发展之路，从先民耕耘生息，到屈子行吟、长坂烽烟，花开花谢千百次，默默守望古城成长。蜡梅不仅为宜昌带来醉人景观和自然意趣，也将城市人文与自然禀赋深度融合，成为城市精神的重要载体。，这一点在WPS官方版本下载中也有详细论述
controller.enqueue(generateData()); // desiredSize: -999999，推荐阅读搜狗输入法下载获取更多信息
Москвичей предупредили о резком похолодании09:45