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An NBA game takes 48 minutes and is divided into four quarters, each lasting 12 minutes. A game takes about two and a half hours to three hours.For interface programming, a lot of changes that may occur in the system in the future can be isolated. Why? If the code is written for an interface, he can implement the interface with any new class through polymorphism. However, when the code uses a large number of specific classes, once new specific classes are added, the code must be changed. Violating the opening and closing principle.君顶会所第一天开张就遭劫持，闻讯赶到的刑警队长巴渝生在劫匪引爆炸弹后，果断率领警察冲进会所救出十余人质，还有三具尸体。但劫匪却“人间蒸发”。巴渝生及时勘查现场，并与每个人质笔录还原了劫案过程，确定劫匪的目标是一件稀世珍宝。劫案中昏迷的那兰醒来，告诉巴渝生，劫匪熟谙心理学，并有强烈预感，凶杀还没有结束。技侦的报告确认会所一楼的大火不是爆炸所为，而是有人纵火。巴渝生在会所储藏室里发现三个劫匪的尸体。但人质确认他们使用的武器却不是人质看到的劫匪所用。难道有两拨劫匪？巴渝生感到案情异常复杂。随着调查的深入，巴渝生发现人质证词的重重疑点。经过细致分析、缜密推理，案情真相最终在我公安干警努力下水落石出。CH1, …但也止于此。