题目内容

吗啡不具有下列哪项作用

A. 兴奋平滑肌
B. 止咳
C. 镇吐
D. 呼吸抑制

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急性吗啡中毒的解救药是

A. 尼莫地平
B. 纳洛酮
C. 肾上腺素
D. 曲马多

Section DSpot dictation. Listen to the following short passage, then fill in the blanks with the missing words or phrases. The passage will be read three times.Good evening, ladies and gentlemen!First of all, I’d like to (20) ______ a sincere welcome to you all, the new comers of our company. As you know, our company is one of the top 50 companies in the country and has a history of more than 100 years. I think you must (21) _ being a member of such a great company. But we cannot (22) tradition alone. We need new employees with new knowledge and creative (23) _.I would like to welcome you (24) ______, and from today, let’s begin to work together.

该凸轮廓线的设计方法采用。

该凸轮推程属于运动规律，速度为常值，为零，但在推程开始和结束两个时刻为无穷大∞，会产生冲击，适用于低速轻载场合。