Question

the ____________ head has revolving turrets with direct - reading double graduations with a full 0 to 180° in opposite directions. square center protractor all the above

Explanation:

A protractor is a measuring instrument used to measure angles. It typically has a semi - circular shape (0 to 180°) with graduations. The description in the question about "revolving turrets with direct - reading double graduations with a full 0 to 180° in opposite directions" matches the characteristics of a protractor. A square is a tool for checking right angles (90°) and has a different design. A center head is not related to this angular measurement description.

Answer:

C. Protractor