A. it can not be polished
B. it is not a fire proof material
C. it is costly
D. it has less crushing strength
Correct Answer: it is costly ✔
Last Updated: January 08, 2019
A. it can not be polished
B. it is not a fire proof material
C. it is costly
D. it has less crushing strength
Correct Answer: it is costly ✔
Last Updated: January 08, 2019