鼻粘膜或齿龈出血时可选用（）
A．酚苄明
B．肾上腺素
C．去氧肾上腺素
D．异丙肾上腺素
E．阿托品
参考答案：B
_____ of concrete and steel, the Petronas Towers in Kuala Lampu could provide a better chance of surviving than did the World Trade Centre buildings.
A．Building
B．Built
C．To built
D．Having built
简述气管、支气管异物的临床特点。
