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If C is creep coefficient, f is original pre-stress in concrete, m is modular ratio, E is Young’s modulus of steel and e is shrinkage strain, the combined effect of creep and shrinkage is________________?

A. (1 – C) mf – eE

B. (C – 1)mf + eE

C. (C – 1)mf – eE

D. (1 – C)mf + eE

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