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All extreme behaviors in case of emergency in the judgment question are wrong, such as stepping on the accelerator (brake) and turning in a sharp direction. Similar answers in multiple choice questions are wrong.唐伯虎神情沉吟，扫了一眼桌上笔墨。FlyWeightFactory is responsible for creating and managing meta-units. When a client requests, the factory needs to check whether there are eligible objects in the current object pool. If so, it returns the existing object. If not, it creates a new object. FlyWeight is a superclass. When it comes to shared pools, It is easy to think of JDBC connection pooling in Java, Considering the characteristics of each connection, It is not difficult for us to sum up: Applies to several objects that are shared, They have some common attributes, Take the database connection pool as an example, url, driverClassName, username, password and dbname, these attributes are the same for each connection, so it is suitable to use the meta-sharing mode to process, build a factory class, take the above similar attributes as internal data and the others as external data, and pass them in as parameters when calling methods, thus saving space and reducing the number of instances.The Differences between "Regulations", "Provisions" and "Measures"Run the script to see if it has any different effects.In February 2018, the initiation traffic of SSDP reflection attacks in China mainly came from 705 routers. According to the statistics of the number of attacks involved, routers (219. X.X.70) belonging to Beijing Telecom involved the most attacks, followed by routers belonging to Beijing Telecom (219. X.X.45, 219. X.X.30, 219. X.X.144) and Tianjin Telecom (221. X.X.1, 221. X.X.2), as shown in Table 6.