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In the historical substitution principle, the methods of the subclass to the parent class should not be overridden or overloaded as far as possible. Because the parent class represents a well-defined structure, subclasses should not destroy it casually by interacting with the outside world through this standardized interface.韩国tvN于2018年3月21日起播出的水木连续剧，由《Signal》金元锡导演执导与《又，吴海英》朴惠英作家合作打造。此剧以拥有相同沉重的生活负担40岁男人与20岁女人出发，讲述他们互相观察并治愈对方的故事。Convert String to Date Time章平很老实，耸拉着脑袋，说道：上将军，我知错了。鲜为人知的贩毒手段，震憾惊人警匪交锋场面，首次披露尸体运毒骇人内幕。现在丽塔不再局限于公立学校规则和官僚主义,所以她可以从头设计她自己的学校,最终塑造它自己的理想。但它并不像听起来那么容易,和火花很快就开始飞,她开始Hjørdis一起工作As mentioned above, SYN attacks can be prevented by increasing the backlog queue. In addition, reducing timeout time also enables the system to process more SYN requests. We know that the timeout timeout, that is, the half-connection lifetime, is the sum of the timeout times that the system waits for all retransmissions. The larger this value, the longer the half-connection takes up the backlog queue and the fewer SYN requests the system can handle. In order to shorten the timeout time, it can be realized by shortening the retransmission timeout time (usually the first retransmission timeout time) and reducing the number of retransmissions.