Haha, you also use China Net, so do I. Let me summarize, there are several points: 1. Windows are different, just like the difference between using ie browser window and other browser windows, Zhongwang cad window is easy to switch and operate. In the middle view, just click on the graphic page, and then automatically drag it to the graphic element section. Click again to select it, and autocad must hold down the left mouse button to drag it. So it's more convenient to look in the middle. 3. The lines are different. The so-called different lines are mainly reflected in cash. The line width of 0.3mm is also used, which is extra thick in autocad after opening, but it does not affect printing. 4. Different fillers. Zhongwang's filling materials are comprehensive, but autocad is relatively few. 5. Need to convert the format. If you use version 20 10 or above, autocad cannot be opened, and you need to save it in autocad format to open it, but it will not affect the use. Ok, that's all, hope to adopt! I suggest you use the net, the file is not big, free registration and activation.