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3. Some types, such as the core trading engine of the exchange, control the trading process. If multiple types can be created, the system will be completely chaotic. (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. The following is an analysis of some examples that we need to pay attention to when applying singleton pattern in the development process.Having seen too many life and death, Huang Weiping often feels powerless. People often think carefully about the proposition of "life and death" when they are dying, but it is too late. At that time, patients and their families are mainly faced with a series of practical problems and have no time to take care of more metaphysical things.There are five kinds of creation modes (1-5): factory method mode, abstract factory mode, singleton mode, builder mode and prototype mode.　　在投资公司工作的林菲邂逅了公司破产欲贷款做养殖生意的“凤凰男”丁伟。此时，因公司破产、城乡文化冲突等原因，其妻肖雅丽正与他闹离婚。Attempt, we used onion skin or persmmon-based dyes combined with blue; In this case, the blue dye acted as a strengthener for the weaker green or pink dyes, preserving the overall color nonetheless. The combinations can of course be altered to answer any color requirements, but it is worth remembering.A Pay attention to the option setting on the right when importing. The unit is millimeters　　目的是窃取我国海洋信息环境与资源信息，而执行“水母计划”的“钓鱼者”身份神秘。