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5 (5) a For a steel thick-walled cylinder subjected to external pressure, which of the following statements is incorrect? (A) Radial stress increases in magnitude from the inner surface to outer surface. (B) Radial stress and hoop stress all very nonlinearly through the wall thickness. © Hoop stress increases in magnitude from the inner surface to outer surface. (D) Hoop stress is compressive through the wall thickness. (6) Two thin-walled steel structures having a same length with the cross-sections shown in the figure below are subjected to a same torque T. Which of the following statements is incorrect for these thin-walled structures? 2R (A) Structure (b) has smaller shear stress than structure (a). B) The shear stress of structure (a) is 4 times the shear stress of structure (b). (C) Structure b) has smaller deformation than structure (a). (D) The twisting angle of structure (a) is 16 times the twisting angle of structure (b).