孕妇,30岁,孕1产0,妊娠40周,临产后出现协调性宫缩乏力,宫颈扩张4cm,胎囊凸,无头盆不称。护士应首先协助处理的是() ["A.镇静剂","B.等待产程自然进展","C.缩宫素静脉滴注","D.人工破膜","E.剖宫产术 "]
频分复用传输系统的缺点是什么?
胎膜早破的原因,哪项是错误的() ["A.子宫收缩乏力","B.头盆不称","C.臀位","D.胎头高浮","E.横位"]
什么情况下左右两侧肺的通气大致相同() ["A.清醒正常人坐位","B.清醒正常人仰卧位","C.清醒正常人侧卧位","D.清醒正常人直立位","E.上述均不对"]
基本肺容积由下列哪项组成() ["A.潮气量(VT)+补吸气量(IRV)","B.VT+补呼气量(ERV)","C.VT+残气量(RV)","D.VT+IRV+ERV+RV","E.上述都不是"]
传输系统按复用方式的不同分:_________、_________、_________和________。