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Conclusion: As long as there is this instance in the task, the page with singleTask set will be reused all the time, and every time the existing instance is reused, the other instances above (FirstActivity here) will be emptied, and the page will be directly promoted to the top of the stack, that is, it will display itself.众人听了一静，都看向大苞谷。/v fol-Follow MeAn exampleSmoke bombs before burning:1945年初，抗战即将取得全面胜利。内外交困的日军垂死挣扎，派出一批精锐间谍，打入驻守空军基地门户淄江城的国军司令部，企图破坏空军基地，从而避免日本本土遭到轰炸的命运。国民党方面派遣反间谍专家雷震前去应对。雷震在地下党组织的配合下，历经千难万险，终于成功消灭日军间谍。而在这个过程中，雷震也完成了思想上的转变，成长为一名共产主义战士，来到新四军根据地参加对日寇的直接作战。在根据地，雷震充分发挥自身才能，以大智大勇的斗争挫败日军一系列阴谋，成功保卫了根据地的安全。特别是妹妹雷蕾和女友乔曼的壮烈牺牲，更激励着雷震英勇奋战，为抗战事业做出了自己卓越而独特的贡献。Since Pizza is still an abstract class, when we create a subclass of FactoryPizzaStore, we should also implement a specific subclass inherited from Pizza. If we only create a subclass of FactoryPizzaStore without a corresponding subclass of Pizza, what does our pizza shop sell?