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What material is used for drainage pipes with a diameter more than 42 inches?
A. vitrified clay
B. concrete
C. cast iron
D. PVC
Answer is B. concrete
for more study resources see the PA page
What material is used for drainage pipes with a diameter more than 42 inches?
A. vitrified clay
B. concrete
C. cast iron
D. PVC
Answer is B. concrete
for more study resources see the PA page
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