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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.Khaki: Guava, wormwood, mango, water chestnut, etc5. For a period of 9 years after the date of entry into force of these Rules, the adjustment of the position of the mast light due to the provisions of Section 2 (2) of Appendix I to these Rules shall be exempted.Self-imported SFC昨日章平确实接到了楚军渡河的消息，紧接着便收到王离那封求援信。