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4. Rst flood attackExplain that in the OrderPizza method, we do a lot of things, including calling the CreatePizza method to generate a desired pizza, and then doing a series of operations on the pizza. The key point is that Pizza is defined as an abstract class, which means that in the OrderPizza method we don't care what type this Pizza is at runtime, in other words, this is decoupling. The coupling between PizzaStore and Pizza is uncoupled.　　文革的号角在不经意间吹响，历史的洪流彻底的改变了所有人的命运……慕容瑶被划成黑五类，于振亚被打成走资派。于红趁势做了造反派，成为工厂造反派小头目，而她暗恋的匡逸夫父亲被打成走资派，被关押在他们厂的“小黑屋”中。大串联、自杀、红卫兵、造反、走资派、右派、强奸……轰轰烈烈的年代里，爱情、亲情、友情已经全被被扭曲，或丑陋或纯真的人性表露无遗……Not on STEAM and other micro-honey, rightJSON refers to the JavaScript Object Notation (JavaScript Object Notation)在处理了她去年的行为所带来的影响后，华盛顿特区的丽莎·阿姆斯特朗被要求协助莫尔坎贝的谋杀案调查。II. Advantages and Disadvantages of Party Committee Members of Group Companies in Thoughts and Actions: