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"Is-A" refers to the "one" of one class and belongs to another class, while "Has-A" is different, which indicates that a certain role has a certain responsibility. A common reason for the wrong use of inheritance instead of aggregation is to mistakenly treat "Has-A" as "Is-A". For example:3.2. 1 The MySQL event scheduler event_scheduler is responsible for invoking events and is turned off by default. This scheduler constantly monitors whether an event is to be called. To create an event, the scheduler must be turned on.另一个小丫头叫道：嗳哟。　　年轻重案组督察何铁男（周文健），凭着天生侦探头脑屡破奇案，在警界早已享负盛名。不久，铁男组别接受了新晋CID Jacky（徐濠萦）毛遂自荐，首天上任，她即遇上了一件匪夷所思的怪事——一只流浪狗前往警署报案。This kind of story and details are everywhere in this book. Historians know that the modern history of China is a dry fact, and the aspects provided by Aban, from the unique perspective of American journalists, are fresh and juicy, and are not well known to us or common to us, thus filling in the gaps, providing references and making history fuller and more complete.Attackers use the controlled host to send a large number of PSH and ACK packets to the target, and the target will consume a large amount of system resources to continuously empty the receiving buffer, resulting in the failure to process the data normally.在人落难时、危急时，都该伸手帮一把，过日子却要靠他们自己。