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Andy: Reading for an average of 2 hours a day;The algorithm takes advantage of the retransmission characteristics of TCP/IP protocol. When the first syn packet from a certain source IP arrives, it is directly discarded and recorded in the state (quintuple). When the second syn packet from the source IP arrives, it is verified and then released.D > B enters the synchronized block, and since instance is not null at this time, it immediately leaves the synchronized block and returns the result to the program calling the method. E > At this point, thread B intends to use the Singleton instance, only to find that it has not been initialized, so an error occurs. Therefore, there is still the possibility of errors in the program. In fact, the running process of the program is very complicated. From this, we can see that it is more difficult and challenging to write programs especially in multi-threaded environment. We further optimized the program:10. Sailing boats or ships with a length of less than 20m shall not hinder the safe passage of motor ships traveling according to traffic separation.可惜，说了也没用，因为如今秦淼在哪他也不清楚。朋克夜总会的副总经理邬立向老板龙会均辞职，在地下停车场被刺死。傣族儿童伊曼目睹了这一幕，杀手循声搜寻之际，一只野猫使他躲过一劫。　　龙会均见手下不是郑烨的对手，带着女友尹怡亲赴云南，歹徒们绑架了瑞缨。尹怡对龙的行径极其反感，自愿让郑烨劫为人质来救瑞缨。在交换人质时，丧心病狂的龙会均枪杀了尹怡，仓惶逃窜。 　　郑烨寻机抓捕到龙会均，但为了引出后台老板，他故意放虎归山。在卧底警员的协助下，郑烨捕获了龙会均和他的后台吴老板，而吴老板也只是个傀儡。 　　真正的后台老板是郑烨非常熟悉的一个女人，在她逃离出境时，郑烨亲手为她戴上了手铐。