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Abstract factory mode refers to providing an interface to create a series of related or interdependent objects, so that clients can create product objects in multiple product families without specifying the specific type of products, emphasizing the change of "series objects". The main points of its implementation include:If the data to be sent empties the send buffer, the operating system 's tcp/ip stack automatically sets the psh flag for tcp packets, Similarly, when the server receives a message set with psh + sck flag, it means that the current data transmission has ended, so it is necessary to immediately submit the data to the service process and empty the receiving buffer without waiting to judge whether there will be additional data arriving.本剧讲述看到MBC走廊里贴着的《大长今》的海报后，想象“他们的子孙现在生活得怎样了？”而开始的故事。除了描写每天过得很辛苦的三兄妹（韩山海、韩珍美、韩正植）的爱情故事，也将加入令人垂涎欲滴的吃播。　　Season 4, Episode 3: The Devil's Foot《魔鬼之足》6 April 1988这是一个循环往复的世界，是深渊，亦是地狱。死寂岛，是一座关了120人的荒岛。绝地求生之中，总有人意外离去。“小丑”是用来看押这120人的角色，被这座岛紧紧控制着。所谓的“生存规则”究竟是真相还是谎言？一切谜底亟待解开。(two) the medical service behavior is partially true, but the declared quantity is inconsistent with the actual situation;