胸内手术时下述何种方法更有效消除术中应激反应()
A.芬太尼+恩氟烷
B.丙泊酚+芬太尼
C.恩氟烷
D.异氟烷+芬太尼
E.硬膜外阻滞+氧化亚氮+恩氟烷
参考答案:E
检验用向下排空气法收集的氢气的纯度,听到尖锐的爆鸣声,这时可应采用的措施是 [ ]
A.用拇指堵住试管口一会儿再收集
B.直接用于实验
C.换一支试管再收集
D.用原试管继续收集
When the manager goes out for vacation, he always leaves his secretary ____ the factory. [ ]
A. in the charge of
B. in charge of
C. in charge
D. in the charge