阴道试产过程中需注意的问题，下列哪项是正确的() ["A．在试产中可使用镇静剂","B．试产时间一般在10～12小时","C．宫颈扩张决定试产是否成功","D．胎膜已破者应缩短试产时间","E．各种类型的骨盆异常均可阴道试产"]
臀位四步触诊检查时，下列哪项是正确() ["A．子宫呈横椭圆形","B．胎体纵轴与母体纵轴不一致","C．耻骨联合上方可触到圆而硬的胎头","D．第三步触诊时可及浮球感","E．触诊不能确定时可行肛诊协助诊断"]
宫口未开全，下列哪项会使产妇过早的屏气() ["A．枕前位","B．枕后位","C．臀位","D．横位","E．足位"]
呼吸衰竭并发右心衰竭的原因() ["A．心肌损害","B．心脏后负荷增加","C．低氧引起中枢神经系统损害","D．CO潴留使外周血管扩张","E．肺动脉高压"]
单臀先露是指() ["A．胎儿双髋关节屈曲双膝关节直伸","B．胎儿双髋关节及双膝关节屈曲","C．胎儿双足先露","D．胎儿双膝关节屈曲","E．胎儿双膝或一个膝关节先露"]
每个stm帧由_________、_________、_________三部分组成。
