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Factory Pattern: Factory Pattern is a frequently used pattern. Classes implemented according to Factory Pattern can generate instances of one of a group of classes according to the provided data. Usually, this group of classes has a common abstract parent class and implements the same methods, but these methods perform different operations for different data. First of all, we need to define a base class. Subclasses of this class implement methods in the base class through different methods. Then you need to define a factory class that can generate different subclass instances according to conditions. After getting an instance of a subclass, developers can call methods in the base class regardless of which subclass instance is returned.故事发生在解放前夕，侠女龙飞飞在实施袭击国民党高官时，遭到了国民党军队的围追堵截，龙飞飞的几个姐妹在奋勇杀敌中先后被击毙，只有龙飞飞一人跳崖得以生还，之后，龙飞飞报仇的信念愈加强烈……一次次的袭击让江淮市驻军惶惶不可终日，龙飞飞所到之处敌军闻风丧胆。国民党侦缉处田处长调来了军中一枝花吉丽冒充龙飞飞并企图追杀她，在一次夜战中，龙飞飞身负重伤被解放军侦察员救获，从此龙飞飞走上了革命的道路，并成为了一名高级特工，被派往湖城展开地下工作。龙飞飞化名何娜，利用军统湖城分局少校谍报员的身份和利用军、警、匪之间的矛盾，把一批批敌人用作潜伏的军用物资安全运抵解放区……Article 33 The fire-fighting technical service institution shall, within five days from the date of completion of the fire-fighting technical service project, file the catalogue of the fire-fighting technical service project and the written conclusion document issued through the social fire-fighting technical service information system.二十年代，还是军阀割据的时候。震鸣回来了，一声枪响，揭开了这个恩爱情仇的故事。他写下——万物霜天竞自由。