对支气管哮喘和心源性哮喘均有效的药物是
A．吗啡
B．哌替啶
C．氨茶碱
D．异丙肾上腺素
E．沙丁胺醇
参考答案：C
— What do you think is _____ to happen to me tomorrow?
— Sorry, I don't know. [ ]
A. possible
B. likely
C. able
D. about
任何一个分馏塔都应包括精馏段、提馏段和进料段。
