羊水过少指羊水量（） [">1000mL",">2000mL","<800mL","<500mL","<300mL"]
下列哪项不为急喉风的表现？（） ["三凹征","吸气困难","呼气困难","吞咽困难","咽喉肿痛剧烈"]
羊水过多指羊水量（） [">1000mL",">2000mL","<800mL","<500mL","<300mL"]
破伤风梭菌的致病机制是（） ["破伤风梭菌通过血流侵入中枢神经系统大量繁殖致病","破伤风痉挛毒素侵入中枢神经系统致病","破伤风溶血毒素侵入中枢神经系统致病","破伤风梭菌产生内毒素引起休克","破伤风梭菌引起败血症"]
胎儿身体纵轴与母体纵轴的关系称为（） ["胎方位","胎先露","胎产式","骨盆轴","胎体轴"]
从（）时候开始，宗庙成为帝王祭祀祖先的专用场所，后世称为（）。
