下列哪些是机械通气的禁忌证（）。
A.急性肺水肿
B.巨大肺大疱
C.低血容量休克
D.哮喘持续状态
E.慢性阻塞性肺疾病伴严重呼吸衰竭
参考答案：B, C
用适当的冠词填空
1. This morning I had _______ egg and_______ bottle of milk for my breakfast.
2. —What's the matter with you?
—I caught _______ bad cold and had to stay in _______ bed.
3. There is _______ "h" in the word hour.
4. _______ sun is bigger than . _______ earth.
5. This is_______ song I've told you about. Isn't it_______ beautiful one?
存在于细菌上的抗原物质很多，如菌体抗原（O），但（）通常不是细菌的抗原
A.神经氨酸酶（NA.抗原
B.菌毛抗原
C.鞭毛抗原（H）
D.夹膜抗原（K）
