A line has no thickness, only length anddirection.
举一反三
- The basic line thickness of the drawing refers to the thickness for the ( ) line A: thin B: semi-bold C: bold D: middle
- the ratio between the thickness of the bold line and the thin line is .
- The ratio between the thickness of the thin line and the bold line is A: 4 B: 2 C: 0.5 D: 0.25
- Only the average thickness can be obtained with quartz crystall oscillation method.
- The line width (thickness) of the cutting symbol should be ( ) A: 0.7b B: 1.0b C: 1.4b D: 2.0b