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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.。safew官方版本下载是该领域的重要参考
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5年来，哈法亚油田持续推动工艺体系迭代升级，依托天然气处理厂等绿色项目，持续提升清洁能源供给与减排成效，同步推进植树养护、环境监测和生物多样性保护，严格落实湿地环境保护要求，以可见可感的生态实践增进当地认同，凝聚共享发展共识。