For effective drainage, the finished surface of flat roof should have

1.	For effective drainage, the finished surface of flat roof should have a minimum slope of
A.	1 in 20
B.	1 to 50
C.	1 in 10
D.	1 in 5.
Answer» B. 1 to 50

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For effective drainage, the finished surface of flat roof should have a minimum slope of

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