In the pipe flow, the cross-section velocity distribution of laminar flow conforms to （ ） A: Uniform law B: Law of linear change C: Parabolic law D: Law of logarithmic curve

In the calculation of the bearing capacity of the normal section of a T-shaped reinforced concrete beam, it is assumed that ( ) within the effective width of the compressed flange. A: the compressive stress is uniformly distributed B: the compressive stress is distributed in a parabolic shape C: the compressive stress is distributed in a triangle shape D: the compressive stress is distributed partly uniformly and partly non-uniformly