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Regionally, North and East China are the regions with the largest application of industrial software, accounting for about half of the country's total. Specifically, Beijing, Shanghai, Guangdong and Jiangsu are regions with strong industrial software strength, accounting for more than half of China's industrial software market.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.此书之诚，天地可鉴，若汪直归顺，此后数十年东南国泰民安。姑娘，看小说要适度，不要沉迷。Each method will be called in turn. The first thing to handle is that this handles most of the events. This example is one of them.别的还都好说，这媳妇可千万不能弄错。In popular terms, it is to use network node resources such as IDC server, personal PC, mobile phone, smart device, printer, camera, etc. to launch a large number of attack requests on the target, which leads to waste of network resources, congestion of link bandwidth, depletion of server resources and interruption of service, making it impossible to provide normal services to the outside world, and only game over can be announced. The detailed description is shown in the following figure: