Open number, also known as paper open number, is used to indicate the paper size in the printing process. The opening number refers to how many plates are printed on a whole piece of paper or how many pieces of paper are cut. A whole piece of paper is said to be fully open; Arrange the whole paper in two plates, fold it in half once or cut it from the middle once, which is called two folds or two folds; Split paper is cut or folded in half from the middle to become four folds.
Related information:
1m = 1m =3 city feet =3.2808 feet.
1 decimeter = 1 square inch =0. 1 meter =3 city inches.
1 cm = 1 cm =0.3937 inch.
That is,1mm = 0.1cm = 0.01cm = 0.001m.