[名词解释] 干燥综合征

分娩时，胎头复位及外旋转的角度为（） ["A.15°","B.45°","C.50°","D.80°","E.90°"] 枕前位胎头娩出后的第一个动作是（） ["A.衔接","B.仰伸","C.俯屈","D.复位","E.内旋转"] 骨盆入口平面最小的径线是（） ["A.真结合径","B.右斜径","C.左斜径","D.坐骨棘间径","E.横径"] 笔帽征 赖特综合征 干燥综合征