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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.从永平二十二年六月开始，秦霖趁元国内乱之机，连续蚕食元国东北部，收伏诸多部落，又使用各种计策，或连横，或离间，或安抚，或强势镇压，竟然占领了小半个元国，自立安国。夏小晚，非典型00后脱线少女，因为脑洞大开的设计被选中，任命为『硅谷装饰设计公司』老板兼金牌设计师陆以深的助理，虽为打杂小妹，但私底下却有一颗成为漫画家的心。陆以深外表绅士帅气，英俊多金，其实本质是腹黑毒舌，在一次意外中，让夏小碗发现了他的真面目，这样的陆以深刺激了夏小晚的创作欲。林聪看着那块形状可疑的肉，怀疑地问道：你没骗我？胡钧见她嘴巴啃得油润润的，心里一阵难受，一把夺过她手中的肉，低声叱道：你还真吃这个？你……你……林聪急得起身跟他抢：给我。老家大宅住着父亲老老头和三个儿子，长子老良、次子老非、老么老恭，还有一個人如其名的媳妇—贤淑。別看小老家一家五口，人口简单，其实在这五人身上，已包括了父子、夫妻及年轻男女的感情故事，这些故事不但充满笑料，亦深深令人感动。As shown in the above figure, this is the water plant appearing at the air outlet when the air conditioning effect is relatively good, and the same water plant is also found on the pipes and evaporators. Water vapor in the air will condense on the evaporator blades to form water droplets when passing through the blades, and the condensed water can absorb some impurities and dust that lead to the air in the cab. Under normal circumstances, the water that absorbs impurities and dust will flow to the bottom of the housing of the air conditioner heating device and drain out of the car through a conduit. In summer, the "leaking" liquid we see under the car is actually this kind of water that absorbs impurities. The following figure; Location of drain hole.王穷，也的确配得起周菡。