合成氨反应的热力学特点及影响因素?
参考答案:
①可逆反应
③正反应气态物质系数减小
④正反应是放热反应
②熵减小的反应
因素:温度和压力;氮氢比;惰性气体
How I wish I could sleep longer! However, I had to get up as soon as the alarm clock _________.
A. ran off B. went off C. took off
麻黄平喘的作用特点是( )
A.化学性质稳定
B.口服有效
C.起效较慢,作用温和
D.作用维持时间持久
E.以上均非