鹳勤个( Additional remarks for bending)四 第十二章弯曲的几个补充问题 (Additional remarks for bending) p512-1非对称弯曲 (Unsymmetrical bending D12-2开口薄壁杆件的切应力 弯曲中心( Shear stress of open thin-wal members. Flexural center)( Stresses in Beams) (Additional remarks for bending) §12–1 非对称弯曲 (Unsymmetrical bending ） §12–2 开口薄壁杆件的切应力 弯曲中心 (Shear stress of open thin-wall members. Flexural center) 第十二章 弯曲的几个补充问题 (Additional remarks for bending）