The review guidelines stipulate that "the drawings in the instruction manual should be drawn using drawing tools including computers and black ink. The lines should be uniform, clear and deep enough. Coloring or alteration is not allowed, and engineering blueprints are not allowed." So use For three-dimensional drawing printing, as long as the lines are clear.
The issues that need attention are complex, but the basic principle is that they do not affect the technician's understanding of the drawings. For example, the section lines in the cross-sectional drawings must not hinder the clear identification of the marked lines and main lines of the drawings. In addition, the words in the attached pictures should be in Chinese.
Does the "serial number" refer to the page number of the drawing? Although there is no clear rule that you cannot use a pen to mark drawing serial numbers, try not to use handwritten marks, and it is not very difficult to print the drawing serial numbers.