A. Steel pipes
B. Steel shell coated from inside with cement mortar
C. Steel shell coated from outside with cement mortar
D. Both B. and C.
Correct Answer: D. Both B. and C. ✔
Last Updated: August 25, 2020
A. Steel pipes
B. Steel shell coated from inside with cement mortar
C. Steel shell coated from outside with cement mortar
D. Both B. and C.
Correct Answer: D. Both B. and C. ✔
Last Updated: August 25, 2020