Arch in cement concrete jack flooring is made of __________ cement concrete.
A. 1:2:4
B. 1:3:4
C. 1:2:3
D. 2:3:4
Answer:A
Arch in cement concrete jack flooring is made of __________ cement concrete.
A. 1:2:4 B. 1:3:4 C. 1:2:3 D. 2:3:4