A. Modern theory
B. Carbide theory
C. Engler theory
D. All A., B. and C.
Correct Answer: Carbide theory ✔
Last Updated: March 02, 2019
A. Modern theory
B. Carbide theory
C. Engler theory
D. All A., B. and C.
Correct Answer: Carbide theory ✔
Last Updated: March 02, 2019