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1. There are two options to manage the creation and destruction of state objects. The first is to create and then destroy state objects only when they are needed, and the other is to create all state objects from the beginning and never destroy them. If the state object is relatively large, the first method can be used to save memory, which can avoid creating some objects that will not be used and recycle them in time. However, if the state changes frequently, it is best to create all these state objects in the first place, and there is no need to destroy them, because they may be used again soon.Some people think that:他也觉得雀跃期盼，因为少了葫芦哥哥和小葱妹妹而空出一块的心理被填补充实。The wheel arch material of the new BMW 3 Series is mainly glass fiber, so it has good sound insulation, which is also the commonly used wheel arch material configuration for models at this price. It is worth noting that the front wheel arch of the new BMW 3 Series adopts a split design, and the front half is made of plastic. The reasons for this will be explained below.1935年，北平艺专摄影科学生吴大中在学生游行时对投身地下党的高海薇一见钟情，并为了爱情参军投身抗战。1937年7月7日，日军悍然炮轰宛平城，高团长（高海薇父亲）为救吴鸿运而牺牲，满心愧疚的吴鸿运更加坚定了杀鬼子的决心，在共产党北平临工委骨干刘永祥的推荐下，吴鸿运和宋玉泉启程奔赴延安。途中得知八路军在平型关集结抵抗日军，毅然加入，吴鸿运凭借自己的机智，在攻打老爷庙的关键时刻立下战功，八路军最终取得“平型关大捷”。在吴鸿运、宋玉泉、高海薇等北平学生抵达延安后，延安领导命吴鸿运组建摄影队并担任摄影队的队长，宋玉泉担任警卫班的班长。两人先后向高海薇表明心迹，面对两个性格迥异的追求者，高海薇左右为难。为了赢得高海薇芳心，队长与班长间展开了激烈竞争，凡事都得争个高下。随后，吴鸿运和宋玉泉又一起编撰《前线》杂志、参加黄土岭战斗、攻打井陉煤矿、收编黑马队，两个情敌也在一路互相较劲中建立起了别样的战友友谊，一起为抗日战争的胜利做出了突出贡献 。Is the water leopard useless