双腔管支气管插管的主要目的是()
A.便于术中分侧吸引
B.防止低氧血症及窒息
C.防止呕吐与误吸
D.隔离两侧肺,分侧通气
E.防止两肺交叉感染
参考答案:D
What are the plans of Wal-mart in China().
A. To buy the retail stores of Trust-Mart.
B. To allow the presence of labor unions into Wal-Mart.
C. To become the biggest food and department store network.
D. All except c.
用浮筒式液位计测量液位时,液位越高,扭力管所产生的扭角越大液位越低,产生的扭角越小。