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问题 单项选择题

沙丁胺醇治疗哮喘的主要药理作用为（）

A.兴奋α受体

B.兴奋β1受体

C.兴奋α、β受体

D.兴奋β受体

E.兴奋α1、β1受体

答案

参考答案：D

解析：沙丁胺醇为一种选择性β2－受体激动剂，β2－受体激动剂是目前最有效、临床应用最广的支气管舒张剂。

选择题
You'll enjoy ______ at the party if you come with us.

A. you    
B. your
C. yourself    
D. himself
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单项选择题

What is meant by the term “radio silence”?（）

A.Stations not directly involved with the on-going distress communications may not transmit on the distress frequency or channel

B.Stations remaining off the air to safeguard proprietary information

C.Two three-minute silent periods，at 15 and 45 minutes after the hour，that provide a transmitting "window" for distressed vessels to transmit distress alerts using J3E

D.Communications on a distress frequency or channel is banned for 24 hours following the cessation of the distress traffic
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