Manholes are less common in (A) Cast iron pipes (B) Steel pipes (C) Hume steel pipes (D) R.C.C. pipes

Manholes are less common in 

(A) Cast iron pipes 

(B) Steel pipes 

(C) Hume steel pipes 

(D) R.C.C. pipes

by

1 Answer

Answer :

(A) Cast iron pipes 

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