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Then the curDateTime variable is used to set the time or date value of the three dates and time editors on the interface, and the time () and date () of QDateTime are used to extract the time and date respectively.But what if there is no teacher? Benjamin Franklin, a famous American scientist and politician, wanted to improve his writing, but there was no teacher around. However, he likes reading Observer magazine very much and likes the logical structure and rhetoric in it.黎水嗤笑道：你看我敢不敢。The Liskov Substitution Principle (LSP) is one of the basic principles of object-oriented design. The Richter substitution principle says that wherever a base class can appear, subclasses can certainly appear. LSP is the cornerstone of inheritance reuse. Only when derivative classes can replace base classes and the functions of software units are not affected can base classes be truly reused, and derivative classes can also add new behaviors to base classes. The Richter substitution principle is a supplement to the "open-close" principle. The key step to realize the "open-close" principle is abstraction. The inheritance relationship between the base class and the subclass is the concrete realization of abstraction, so the Richter substitution principle is the specification of the concrete steps to realize abstraction. --From Baidu林聪也用力点头，心慌地看着严将军。These are the core configuration requirements of the game. As long as the match is balanced, those who meet the above hardware requirements can run DNF smoothly.三个但是，才能表达我此刻的心情。