短语词组短语frictional deflection angle 摩擦偏角internal frictional angle 内摩擦角;内磨擦角inner -frictional angle 内摩擦角frictional angle WESTBANK 摩擦角inner frictional angle 内摩擦角residual frictional angle 残余摩擦角 返回 frictional angle