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When using Haochen CAD for drawing, selecting objects is a basic operation, but it is also an essential and important task. Because selecting objects in CAD is an operation required for most tasks. The same is true in HaoChen CAD; only by selecting an object can the system know which object you want to operate on. Haocheng CAD offers many object selection methods; for example, using the quick selection tool, you can quickly filter out the target objects from a large number of graphics. Furthermore, the selection function in the HaoChen CAD extension tools can also automatically select objects that meet the criteria based on attributes such as color and type of the target objects. But in this tutorial, we will only introduce the most basic and commonly used selection methods. I. Methods for selecting objects in CAD: Click selection. Generally speaking, in Haochen CAD, “click selection” and “box selection” can be used to select objects. “\"Clicking\" means using the mouse to directly click on an object to select it; by default, this action can be repeated to select multiple target objects. II. CAD object selection method: Select by box. The functionality of \"selecting by box\" is more flexible than that of \"selecting by point\", especially when multiple objects need to be selected and the drawing is complex; the flexibility of this method is quite evident, which is why it is the most frequently used selection technique in CAD. Selecting an area is also very simple: click the left mouse button in an empty area, then move the mouse to \"draw\" a rectangular frame, as shown in the figure below. It should be noted, however, that when moving the mouse to draw a rectangular selection box, if the mouse is moved from the top-left corner to the bottom-right corner, only objects that are entirely within the selection box will be selected; objects that intersect with the selection box will not be selected. When the mouse is moved from the upper right corner to the upper left corner, not only are the objects within the selection box selected, but also all objects that intersect with the selection box are selected, as shown in the figure below. The methods for selecting objects in CAD mentioned above are mainly two basic ones: point selection and box selection. Clicking means simply using the mouse to click on an object, while selecting a range involves using the left mouse button to draw a boundary around multiple objects. In practice, different methods can be chosen depending on the requirements of the drawing.