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Qiao RenliangIn the past three months, the average number of domestic operator routers that have been used to forward cross-domain forged attack traffic is 177. The monthly increase rate and extinction rate of domestic cross-domain counterfeit traffic source router resources are 33% and 29%, respectively. Compared with the average monthly increase rate of 22% and extinction rate of 20% in 2017, the change rate of resources is accelerated and the stability that can be utilized is reduced. There are 72 cross-domain counterfeit traffic source routers that have been active in the past three months. The distribution of their provinces and operators is shown in Figure 19, mainly located in Guangdong Province, Shanghai City and Sichuan Province, with telecommunications accounting for the largest proportion. Among them, there are 9 historically active months with more than 12 months, and the detailed information is shown in Table 10.Factory method: Create a single object, which is used in Abstract Factory.你就确认这几人了。Outdoor fire hydrant pipe network form (ring and branch) and pipe diameter, number of fire hydrants, outdoor fire hydrant layout.