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Cube strength of controlled concrete to be used for pretensioned and post-tensioned work respectively should not be less than__________________?

/ Design of Concrete Structures, MCQs / Q&A / By
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