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3. Some classes, such as the core trading engine of the exchange, control the trading process. If multiple classes can be created, the system will be completely messed up. (For example, if there are multiple commanders in an army who command at the same time, there will definitely be a mess), so only by using the singleton mode can the core transaction server independently control the whole process.张哲修三次相遇赵安娜，三次损失钱财，内心忿恨发誓要找机会讨回。朴比利表示已对赵安娜忍无可忍后，赵安娜于雨夜独坐豪华游艇喝闷酒，一不小心身坠大海。因为尸首找不到，朴比利认定赵安娜已死，掩饰不住兴奋，但赵安娜被人救上岸送进了医院，只是失去记忆。医院里，张哲修发现失忆的赵安娜，正要请保姆照料三个侄子的他灵机一动，哄骗赵安娜说两人是男女朋友关系，唤她“罗丧失”将她接回了家中……据钱明说，不时有零星的车队进出寨子，然寨子里却没有多少仓库。The system is not protected by SynAttackProtect when the SynAttackProtect value (unless otherwise noted, the registry key values mentioned in this article are all hexadecimal) is 0 or not set."Then you mean, in the subsequent battle with the" killer bee ", you still rely on the guns in your hands? If so, what effective means do you have to persist in fighting?" I asked.