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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.这事不怪煜儿，都是我不好，是我不好。《铁血女骑兵》讲述了在血雨腥风的抗日战争期间，云南一群少数民族的热血儿女为保卫民族尊严英勇抗战的故事。段钧豪出演一位热血正义的国名党特务队长林涛，与共党儿女演绎了一段互助、互敬又争锋相对的革命情感。　　二哥海峰，他生在一个富裕的家庭，却因隔阂深感无家可归。《爬坡上坎》是一部反映现实生活的喜剧，剧中老崔担任一家制药厂厂长十几年，极不情愿地退休后，一个死了老公的职工家属迟明琼找他翻起陈年旧帐，硬说老崔要对自己老公的死负责，而真正令老崔心烦的，却是三个性格迥异的女儿的命运抑或生活问题。大女儿崔琪在一家美发厅当发型师，美发厅效益不好，换了老板，使崔琪陷入了从发型师“改行”按摩女的艰难抉择中……在学校的第一天，莫丽佳就遇到了一个大问题，由于她的无知，她与拥有整个学校的那个人结仇，却误打误撞开启一段奇妙姻缘......DNS NXDOMAIN Flood attacks are similar to DNS QUERY Flood except that they query real domain names.