急性阑尾炎最严重的并发症是（）
A.阑尾穿孔腹膜炎
B.门静脉炎
C.膈下脓肿
D.盆腔脓肿
E.肠间脓肿
参考答案：B
This computer is _______________ .
A．twice as expensive as that one
B．twice expensive than that one
C．as twice expensive as that one
D．two times as expensive as that one
将用以研究的风险列表是（）的一个输出。
A、风险识别
B、风险定性分析
C、风险定量分析
D、风险应对规划
