A. heavy water
B. concrete and bricks
C. graphite and concrete
D. deutrium
E. graphite
Correct Answer: graphite ✔
Last Updated: January 24, 2019
A. heavy water
B. concrete and bricks
C. graphite and concrete
D. deutrium
E. graphite
Correct Answer: graphite ✔
Last Updated: January 24, 2019