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When using the HaoChen CAD drawing software, the spline curve function is sometimes necessary. Although it isn’t as commonly used as commands such as lines or circles, it is still quite important to a certain extent. Next, I will provide a detailed introduction to practical examples of closing CAD spline curves. The steps to close a CAD spline curve are as follows: 1. First, open HaoChen CAD, click on 【Drawing】|【Spline Curve】, or directly enter SPL in the command line; SPL is the shortcut key for spline curves. As shown in the figure below: 2. Click on a point on the graph, then move the mouse to click on another point; click as many points as needed to determine the shape of the line. Finally, press the space bar three times in succession to confirm the shape of the spline curve and exit the command. As shown in the figure below: 3. If you want to change the shape of this curve, you can click on the line; grip points will appear. By clicking and dragging these grip points, you can control the shape of the line. As shown in the figure below: 4. If you want to draw a closed spline curve, simply click the spline curve command, use the mouse to draw the spline curve in the drawing area; once it’s drawn, enter “C” in the command line and press Enter to confirm. As shown in the figure below: The above are the detailed steps for drawing closed spline curves using the HaoChen CAD drawing software. During the actual drawing process, it is necessary to follow the instructions provided in the command line. I hope this tutorial can be helpful to everyone.