人工流产时,患者出现颜面苍白、胸闷、脉慢及血压下降,应首先考虑的是().
A.空气栓塞
B.羊水栓塞
C.人流综合征反应
D.吸宫不全
E.子宫穿孔
参考答案:C
开启四级模式环流气体流量67Nm3/h,真空槽内残余压力为8600pa时,环流速度()t/min。
A.113
B.73.9
C.95.4
D.125.7
which of the following is the BEST tool for showing the team the project schedule status during project execution ?()
A.Milestone char
B.Gantt char
C.Work breakdown structur
D.Network diagra