Question

Which line type is thick and black

Answer 1

Answer:

Object lines and hidden lines.

Hope it helps you.

Answer 2

Which line type is thick and black,

Hidden Lined (Thick) :

Hidden Lined (Thick) type lines consist of thick short dashes, closely and evenly spaced.

These lines are drawn to represent hidden or invisible edges of the objects.

The thickness of the lines must be chosen according to the type and size of the drawing .