What is the designer's hand-drawn paper like?

Hand-painting is hand-painting, and standard is mechanical drawing standard. Take a good look at the above standards, such as line type, line width, view, labeling and so on. Drawings must be clearly expressed, not in a general sense or artistic expression. What is required is preciseness and accuracy, the view cannot cause ambiguity, and the size cannot be missing! First of all, manual drawing requires a clean overall feeling, and you can't get the picture dirty just because it is drawn with a pencil. There are also standards for drawing frames, and this can't be casual. In addition, the line type must be correct, with solid lines and dotted lines. Also, the view must be accurate, the view must clearly express the shape of the part to be drawn, and the necessary cross-sectional, directional and detailed drawings must be drawn. The most important thing is that the dimensions must be correct and reasonable, and the key dimensions must be available, mainly the dimensions of contours and important features. Considering the feasibility of the process, the dimensioning is very particular, and there can be no contradiction. Try not to mark the space size, technical requirements, roughness and fit tolerance.