The general plan is generally the same in the whole design, which is called the general plan. Monolithic parts refer to design drawings that are different from general drawings and have slight or essential changes, so it is necessary to draw monolithic drawings. For example, the strong and weak electricity, fire protection, lightning protection and grounding in building construction can be seen in the general plan, while the non-bearing wall has some blocks, some perforated bricks and some red bricks. When a part or monomer is different, it is a monomer part drawing!