初产妇，妊娠39周，胎儿与母体纵轴相互垂直，孕妇腹前壁可触及胎儿肢体，其胎方位是() ["A．肩左后","B．肩左前","C．肩右后","D．肩右前","E．不能诊断"]
病理缩复环最多见于下列哪种情况() ["A．胎儿畸形","B．子宫收缩乏力","C．头盆不称","D．软产道异常","E．臀位"]
血浆存在()红细胞内存在()白细胞内存在()肾小管上皮细胞存在() ["A．碳酸酐酶","B．假性胆碱酯酶","C．两者均有","D．两者均无"]
坐骨结节间7cm，后矢状径7.5cm，足月妊娠，正确的分娩方式为() ["A．自然分娩","B．会阴侧切术","C．胎头吸引术","D．产钳术","E．剖宫产术"]
治疗房颤和阵发性室上性心动过速的一线药物是硝酸甘油。()
简述单肺通气期间低氧血症的处理。
