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Let's first look at how to order a pizza:The combination mode is also called part-to-whole mode. The combination mode combines objects into a tree structure, which is used to represent the relationship between the whole and the part. The combination mode enables clients to treat individual objects and combined objects equally. For example, in. NET, simple controls such as WinForm controls, TextBox and Label inherit from the Control class, while composite controls such as GroupBox also inherit from the Control class. The specific structure diagram of the combination mode is shown below.Events replace the work that could only be performed by the scheduled tasks of the operating system, and MySQL's event scheduler can be accurate to one task per second, while the scheduled tasks of the operating system (such as CRON under Linux or task planning under Windows) can only be accurate to one task per minute.Top一个91岁的男子，被家人和朋友甚至他自己所遗忘，即将深深陷入孤独和痴呆。而在有机会短暂重获记忆时，格雷身上发生了巨大的转变，他要利用自己宝贵的清明时间去揭开侄子的死的谜题，以及接受自己的过去。