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Singleton: Guarantees that a class has only one instance and provides a global access point to access it.全军听令，休息半个时辰，然后在赶路……将士们见项羽说的如此坚决，只好欣然领命，乖乖坐下休息，抓紧每时每刻的时间休息。1) There is no need to install SPTD driver by oneself, restart, install the original version, restart and install the Chinese version, which is so tedious that anyone is afraid of it.一家由自称无所不知的巫师提供各种服务的店家引起了一名顽强刑警的注意。According to IDC's 1998 survey, the industries with high demand for IT personnel are: telecommunication, business services, medical care, retail and wholesale, and financial services. Compared with the technology industry, which employs purely technicians, it will come in a much wider range.Explain that in the OrderPizza method, we do a lot of things, including calling the CreatePizza method to generate a desired pizza, and then doing a series of operations on the pizza. The key point is that Pizza is defined as an abstract class, which means that in the OrderPizza method we don't care what type this Pizza is at runtime, in other words, this is decoupling. The coupling between PizzaStore and Pizza is uncoupled.整座府邸分三块，呈倒品字型分布。