Bottom openings 15 cm x 15 cm in the standing baffle wall are provided

1.	Bottom openings 15 cm x 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

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