Cube strength of controlled concrete to be used for pretensioned and post-tensioned work respectively should not be less than__________________?
(A) 35 MPa and 42 MPa
(B) 42 MPa and 35 MPa
(C) 42 MPa and 53 MPa
(D) 53 MPa and 42 MPa
Cube strength of controlled concrete to be used for pretensioned and post-tensioned work respectively should not be less than__________________?
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