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We know that IPTables acts according to rules. Let's talk about rules. Rules are actually predefined conditions for network administrators. Rules are generally defined as "if the packet header meets such conditions, this packet will be processed in this way". The rules are stored in the packet filtering table in kernel space, specifying the source address, destination address, transport protocol (such as TCP, UDP, ICMP), service type (such as HTTP, FTP, and SMTP), and so on. When packets match the rule, iptables processes these packets according to the methods defined by the rule, such as accept, reject and drop. The main task of configuring a firewall is to add, modify, and delete these rules.这部剧采用的是一种写实的风格。2. Simulate virtual CD/DVD-ROM/HD DVD and Blu-ray drives. Wizard Virtual CD-ROM Concise Edition enables you to imitate up to 4 CD/DVD with the same computer. Virtual drives will be shown in your operating system as if they were real. Select a virtual drive and then select the CD image you want to install. Find the virtual CD-ROM drive that has been created with the CD image on My Computer and you can start working. It is like using a real drive, but it is faster!　　通过诈尸成功逃狱的黑桃Q与特务组织头目黄先生联络，黄先生给他提供了住处。公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.呵呵……杨长帆强笑一声，严格来说，这炮其实就是从海盗那里传过来的，不过不是中国海盗，也不是倭寇，而是葡萄牙人，当然葡萄牙是后来的发音，根据这会儿的发音习惯，我们将葡萄牙称为佛郎机，因此这炮也叫佛郎机，或者佛郎机铳，不过值得一提的是，迄今为止，明朝在与葡萄牙的武装冲突中从未吃亏，并且获得了这个制炮技术。