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甚至不惜以两军开战对靖军施压都是她的主意，她在用自身做赌注。……ps：两更连在一起，这是第一更。? ? ? ? 2) In another way, install the repo library through yum, and then let yum find associations and dependencies according to the library itself.Hardware Firewall: Some firewall functions are implemented at the hardware level, while the other functions are implemented based on software, with high performance and high cost."If the situation develops in this way, it is also to find the weakness of this" killer bee "? As long as we grasp our weaknesses and require our superiors to equip them with more flame throwers, will the situation be much better? Or can you use these 4 74 flamethrowers to attack these "killer bees" more effectively and hold the position more easily than this first encounter with "killer bees"? "I asked.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.