The minimum cube strength of concrete used for a pre-stressed member,

1.	The minimum cube strength of concrete used for a pre-stressed member, is________________?
A.	50 kg/cm2
B.	150 kg/cm 2
C.	250 kg/cm2
D.	350 kg/cm2
Answer» E.

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The minimum cube strength of concrete used for a pre-stressed member, is________________?

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