How to draw the rear view in the engineering system?

There are strict specifications and methods for engineering drawing, and even sketches should not be sloppy, because sketches are temporary drawings that do not meet the drawing conditions and need deeper drawing skills:

1. The principle of long alignment, flush width and equal height should be followed to make the sketch as formal as possible to clearly express the object.

2. The dimensions must be clearly marked, which is the most accurate place in the sketch. Unclear dimensions should be specially marked and implemented.

3. The sketch will eventually be archived, so each drawing element should be clearly expressed without any mistakes.