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Is to create a factory class to create instances of some classes that implement the same interface. First, look at the following diagram:Here are the steps for configuring iptables-service in centos7看到这位太宰大人的表情，随何知道，能否顺利见到刘邦，很大的希望救寄托在这位太宰大人身上。Wang Zeduan previously described that the blood-like liquid flowing out of this strange dog after being hit by steel balls produced by anti-infantry mine explosions is also green, Combined with what Zhao Mingkai said now, It can be determined that for this strange dog, Just as blood represents the primary color of human body fluids in red, The primary color of their body fluids is green, And more unified than human beings, After all, the human brain solution is milky white, Unlike blood, However, whether they are blood or brain solution (in fact, I don't know if it is their blood or brain solution, so I used the word "image" to describe them in front. After all, whether they are natural or artificial, they belong to unknown species, but for convenience of description, they are all green.P3D environment: FTX Global/VECTOR, Terraflora, REX4TDE, REXSF, REX WWA, PTA, ASP4, ChasePlane当日下午，周勃便率领着急地赶去了成皋，布置防务。