对于急性水肿性胰腺炎下列哪项处理最重要（）.
A.抑酸药
B.禁食
C.胃肠减压
D.抗生素
E.监测中心静脉压
参考答案：B
--Is Peter a new member in your art club?
--No. He _____ our club for two years.
A. joins B. has joined C. has been in
传动系的传动比等于变速器传动比与主减速器传动比的（）。
A.总和
B.差值
C.乘积
D.商值
