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NASA announces major overhaul of Artemis moon program amid safety concerns, delays: "We've got to get back to basics"，推荐阅读旺商聊官方下载获取更多信息
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文 | 锌刻度，作者 | 李觐麟，编辑 | 黎文婕
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.，这一点在91视频中也有详细论述