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Explain 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.Russell and Finlay must confront a serial killer case from their past while working in Seattle when a copycat killer suddenly emerges in Las Vegas.The foundation of SYN flooding attack is the design of three-way handshake when TCP is used to establish connection. The third packet verifies that the connection initiator has the ability to accept the packet at the source IP address used in the first request, that is, its return is reachable. Figure 1 shows the process of exchanging packets at the beginning of a normal TCP connection.1977年的伦敦郊区，三个痴迷庞克音乐的男孩，整日游荡街头、耍废装酷。某日得知当地的庞克精神领袖要举办派对，青春生涩的男孩们决定闯入把妹，没想到却误入外星人派对。撩妹不成，反而对外星女孩一见锺情，为了展现地球人的大爱，一场四十八小时的地球庞克体验之旅也就此展开！本片改编自奇幻小说家尼尔盖曼的同名短篇故事，曾以《摇滚芭比》风靡影乐坛的导演约翰卡麦隆米契尔，巧妙结合宅男把妹与外星人报到的喜剧元素，并添入庞克音乐与叛逆精神，找来妮可基嫚变身银髮爆炸头庞克教母，嘶吼呐喊摇滚不死；饰演外星女孩的艾儿芬妮，则是从乖巧天真，摇身一变为性感烟燻庞克妹，在迷幻怪诞的影像风格中，与潜力新人亚历克斯夏普，谱出一段诡谲浪漫的恋情。继母因无力负担生活，将苏菲和她的两个姐姐都送到了制帽店去当学徒。两个姐姐很快先后就离开了制帽店去追寻各自的梦想，只有苏菲坚持了下来。一天，小镇旁边来了一座移动堡垒，传说堡垒的主人哈尔专吸取年青姑娘的灵魂，所以小镇的姑娘都不敢靠近。小鱼儿这一生真是太惨了，这条小鱼到底还要受多少的苦难？小鱼儿会不会近墨者黑，真得如几大恶人希望的那样，变成最恶的恶人、恶人之王？不过等到小鱼儿再次出场后，大家却看到一个精灵古怪、俏皮捣蛋、花招百出的坏小子。不交税的话，国家就没钱养官兵，就没人去边关打仗、就没人保护百姓了。