下列哪项不是胸腔闭式引流的目的：（） ["重建负压使肺复张","开胸术后引流","平衡压力，防止纵膈移位","用于治疗已停止漏气的小量气胸","需要持续排气、排液、排脓者"]
Which two are elements of the operational-efficiency business challenge?（） [" improving business processes"," making existing resources more productive"," offering enhanced customer service"," providing flexible channel and delivery optio"]
共晶体
安全评价中常用（）和参照事故类别的方法进行分类。 ["导致事故的直接原因","系统分析","导致事故的间接因素"]
若显示分辨率为1024*768，256种颜色，则显示存储器容量至少为多少KB？
简述气血的主要功能。
