使用干粉吸入器时的吸药方式是以下哪项?()
A.缓慢深吸气
B.快速深吸气
C.平静呼吸
D.肺活量吸气
参考答案:A
21st Century is ______ a newspaper; it helps us know a lot about the world.
A.more than
B.no more than
C.not more than
D.no less than
迄今查知,GABA受体有哪几种类型()
A.直接与Na+通道耦联的GABA受体
B.直接与Cl-通道耦联的GABA受体
C.直接与K+通道耦联的GABA受体
D.直接联接于G蛋白的GABA受体
E.直接与Ca2+通道耦联的GABA受体