CAD how to select the same layer of objects at a time

You can use the command LAYOFF to turn off the selected elements of the layer (LAYISO is to lock the selected elements of the layer outside the layer), of course, LAYON is to open all the layers, locking the board can only be into the layer manager point.

If you are using Tianzheng, directly press the number key 2 to open the object selection! Object selection is very easy to use.

CAD:

Computer Aided Design (CAD-Computer Aided Design) refers to the use of computers and their graphics equipment to help designers design work. In the design usually use the computer to carry out a large number of calculations, analysis and comparison of different programs to decide the optimal program; a variety of design information, whether digital, text or graphics, can be stored in the computer's memory or external memory, and can be quickly retrieved; designers usually use sketches to start the design, the sketches into a working picture of the heavy work can be handed over to the computer to complete; by the computer automatically produces the design results, can quickly make graphics, so that designers make timely judgments and modifications to the design; use of computers can be edited with graphics, zoom in, zoom out, pan, copy and rotate and other related graphic data processing work.