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问题 单项选择题

镇痛作用是吗啡的80倍，为一速效、短效、强效的镇痛药是（）.

A．哌替啶 

B．美沙酮 

C．芬太尼 

D．可待因 

E．喷他佐辛

答案

参考答案：C

单项选择题

B型超声诊断仪是指（）。

A.振幅调制型

B.辉度调制型

C.彩色血流显像

D.多普勒频谱显示

E.以上都不是
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选择题

A mysterious illness, referred to as “ a typical phenomena”, has been brought under control, the government said on Wednesday, ______ no cause of it has been made public.

A．though

B．when

C．that

D．because
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