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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.　　朱棣微服出巡，来到县城，此时各路人马也暗暗涌入。最终在三个女人的帮助下，朱棣拿到自己想要的物件，起兵夺位，坐上龙椅，封包三姑为御妹，书生也顺利当上县令。From March 1, 2009 in Heilongjiang, the subsidy for hygiene products for female employees was increased from 10 yuan to 20 yuan per person per month.At this time, many people think that gender affects the classification ability of babies, but Professors Heron and Slaughter do not think so. They think that the difference in classification ability of babies of different genders is not due to gender, but due to the different knowledge and experience they have acquired. For example, the fact that male babies can classify cars may be that they pay more attention to the color and wheel movement of toy cars and pay less attention to the information of dolls.If you meet MM in the morning, you should say good morning; If you meet MM in the evening, you should say good evening. When I meet MM wearing a new dress, I want to say that your clothes are so beautiful. When I meet MM's new hairstyle, I want to say that your hair is so beautiful.秦淼含泪对他笑道：不要紧。做最后的拼死抵抗，同时向彭城和河北各大诸侯发出了求援信。