By comparing the torsional problem of prismatic shafts with the membrane inflation problem, which of the following arguments are correct?
选项：

A:They have the same type of governing equations and boundary conditions.;
B:The twisting moment is equivalent to twice of the membrane volume.;
C:Prandtl stress function is equivalent to the membrane elevation function.;
D:The unit angle of twist is related to the uniform pressure acting on the membrane.