The ratio between the thickness of the thin line and the bold line is
A: 4
B: 2
C: 0.5
D: 0.25
A: 4
B: 2
C: 0.5
D: 0.25
举一反三
- the ratio between the thickness of the bold line and the thin line is .
- The basic line thickness of the drawing refers to the thickness for the ( ) line A: thin B: semi-bold C: bold D: middle
- A line has no thickness, only length anddirection.
- which of the following requirements for extension line is correct? A: it should be draw by bold solid line B: about 2 mm from the contour line C: a bout 2 mm beyond the dimension line D: Other lines in the drawing should not be used as the extension line. E: about 2-3mm in length
- The line width (thickness) of the cutting symbol should be ( ) A: 0.7b B: 1.0b C: 1.4b D: 2.0b