Construction lines are the only lines on a drawing which should be light.
举一反三
- Which of the following lines are used as dimension lines， extension lines， leader lines， construction lines， section lines and projection lines？（ ） A: Thin phantom lines B: Thin solid lines C: Thin center lines D: Wavy lines
- Basically, lines can be used in three ways in drawing: to be used as contour lines, hatching lines, and cross-hatching lines.
- Polylines are much more complex than lines，construction lines and ray lines.
- How many regions would 79 lines separate a 2-D plane? Assume that no three lines cross at the same point, i.e. lines only cross in pairs.<br/>______
- 中国大学MOOC: A piece of writing which is not patterned into the lines is called ______; if it is patterned into lines, it is called verse.