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Preface Sharing:NotifyObservers ();Cabernet Sauvignon-Cabernet SauvignonSingleton is a common design pattern. In Java applications, a singleton object can ensure that only one instance of the object exists in a JVM. This model has several advantages:For the operation and maintenance phase, BIM technology can be used to realize virtual reality, asset statistics, space management, building system analysis and disaster emergency simulation. BIM model can improve the efficiency of operation and maintenance, reduce costs, improve the service life of subway and avoid operation and maintenance risks.Weightlifting's snatch result is much lower than its squat result. If you squat 160KG to the limit, you naturally don't need a belt when you squat 80KG. However, the results of strength lifters are almost close to or more than twice as much as those of weightlifters of the same weight, without belts? It will kill people.