哮喘发作时应禁用（）
A.氨茶碱
B.吗啡
C.异丙肾上腺素
D.非那根
E.注射肾上腺皮质激素
参考答案：B
Mary was praised by the headmaster in public and on that _______ she was simply proud.
A．position
B．circumstance
C．occasion
D．situation
快怠速控制阀主要由（）、（）和（）组成。
