How to draw this in mechanical drawing cad?

This is set in the layer, and the 2007 version may not be convenient to set in the layer. Thick is thick solid line. If you can't set it in the layer, look at this picture, choose the thickness here, and open the line width after drawing. In order to facilitate drawing, the line width is generally turned off when drawing, and turned on after drawing to check whether the drawing is correct. Hope to adopt.