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4. Set several possible formulas to calculate its correctness. Draw a preliminary conclusion.(6) Key Position: The attacker uses his body to block the defender behind him and occupies a favorable catching position.So now, originally one object was responsible for instantiating all specific classes, now through some changes to the PizzaStore, a group of subclasses are responsible for instantiating specific classes: the subclasses of FactoryPizzaStore are responsible for implementing CreatePizza;1990 奥斯卡奖 最佳编剧 　　At present, many products are doing this, not to mention commenting on what is worth buying Little Red Riding Book. Even Meituan, a platform with preferential strategy, is trying to make content. For example, the movie highlights of Cat's Eye movies and the "How to Play for Two Days and One Night" of Meituan's tour are consumption decisions.Intermediator mode: Pay attention to the interaction between encapsulated objects, and decouple by encapsulating the complex interaction between a series of objects so that they do not need to explicitly refer to each other.项羽本人因为立后的事情和范增起了争执，自然不愿意想别的女人凌驾于虞姬之上，所以宫中并无其他妃嫔。