%_Bottom openings 15 cm ‚àö√≥ 15 cm in the standing baffle wall are provided_%

%_Bottom openings 15 cm ‚àö√≥ 15 cm in the standing baffle wal

1.	%_Bottom openings 15 cm ‚àö√≥ 15 cm in the standing baffle wall are provided_%
A.	15 cm c/c
B.	22.5 cm c/c
C.	30 cm c/c
D.	50 cm c/c
Answer» C. 30 cm c/c