What is the specification coefficient of paper width and frame size in cad system standard?

First of all, talk about painting code. Take A4 as an example: 2 10X297 refers to a piece of A4 paper. Its long side is 297mm (mm) and its short side is 2 10mm (mm).

On the specification coefficient: take the drawing size of A 1 (594X84 1) as the standard size length. Based on it, the paper size of A0 is twice that of A641x1kloc-0/89, so its coefficient is 2, and the paper size of A2 is A668. It's detailed enough. Please accept it.