Which of the following statements is not correct for curved beams?
A、All cross sections possess a vertical axis of symmetry lying in the plane of the centroidal axis
B、Sections originally plane and perpendicular to the centroidal beam axis remain so subsequent to bending
C、The curved beam is a solid of revolution, with its axis, inner and outer surfaces being circular arcs about the axis of revolution
D、The influence of transverse shear on beam deformation must be taken into account