TCP协议主要由哪几部分组成() ["报文格式","数据指针","状态机","定时器"]
表示某地1995年5种不同类型病毒性肝炎发病人数占病毒性肝炎发病总人数的比重,宜采用() ["直方图","直条图","线图","圆形图","散点图"]
分娩镇痛静注哌替啶下列哪项正确() ["在胎儿娩出前3小时","在胎儿娩出前3.5小时","在胎儿娩出前4小时","在胎儿娩出前4.5小时","在胎儿娩出前5小时"]
为保障胎盘的良好血液灌注,母体收缩压最低不低于() ["55mmHg","95mmHg","60mmHg","75mmHg","85mmHg"]
PPP协议是提供在点到点链路上传递、封装网络层数据包的一种数据链路层协议,它提供的功能有() ["链路控制协议(LCP)","PAP和CHAP验证","多通道绑定(MP)","网络控制协议(NCP)"]
简述甲状腺机能亢进症的手术适应征