[名词解释] 继发性骨质疏松症

下述“溃疡性结肠炎”早期征象，错误的是() ["A．苹果核征","B．无名沟、无名小区模糊、粗糙","C．“腔壁线”毛糙","D．肠壁表面针尖样钡影","E．无名沟宽度超过1.0mm"] 强直性脊柱炎 食管贲门失弛缓症的典型X线表现是() ["A．食管蠕动减弱","B．食管下端不规则狭窄","C．食管下端鸟嘴样或漏斗状狭窄","D．钡剂通过缓慢","E．食管极度扩张"] 原发性骨质疏松症 骨质疏松症(OP) 继发性骨质疏松症