In CAD standard drawings, what are the scientific names of the two lines under the "drawing name" and what are the drawing standards?

In CAD standard drawings, the thick and thin lines are called "civil and military lines", which is a traditional marking method used to distinguish names and contents in traditional Chinese drawings.

Internationally, single-line marking is usually used, which is highlighted by adding a horizontal line below the text.

At the operational level, the following are the specific steps: First, start the CAD editor and open the program interface by double-clicking the icon.

Next, find the "File" menu in the upper left corner, select the "Open" option, locate and select the file containing the drawing.

In the open drawing, we can enter the layer management function by clicking "Viewer" or "Editor".

In the layer window, find the corresponding line width setting area, where you can adjust the line width to reflect the thickness effect of the "civil and military line".

After completing the line width settings, remember to save your changes to ensure the accuracy and consistency of the drawing.

In this way, you can easily mark and draw "civil and military lines" clearly on CAD drawings, whether it is traditional domestic practices or international standards.