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人物关系Therefore, although we use the service iptables start to start the iptables "service", in fact, iptables does not have a daemon, so it is not a real service, but a function provided by the kernel.Xiao Wang's rights protection group organized a total of two actions, and the second action brought about a huge change in some of Xiao Wang's ideas. According to his statement, "Before that, I could understand some necessary measures taken by law enforcement officers to maintain social stability, but I did not understand what happened that day."伦文叙和同学们在这个危机四伏却又充满温馨的校园内一起学习和生活，一起经历风雨和彩虹，演绎了一出出搞怪爆笑的现代校园喜剧。An event can be active (open) or stopped (closed). Active means that the event scheduler checks whether the event action must be called. Stopping means that the declaration of the event is stored in the directory, but the scheduler does not check whether it should be called. After an event is created, it becomes active immediately, and an active event can be executed once or more times.Public void add (Observer observer) {