异丙肾上腺素治疗哮喘时常见的不良反应是
A.中枢兴奋
B.舒张压升高
C.心动过速
D.体位性低血压
E.腹痛
参考答案:B
— You’d better not _____ time talking to him. He won’t change his mind.
— I agree with you. [ ]
A. waste
B. allow
C. save
D. kill
投入高压加热器汽侧时,要按压力从低到高,逐个投入,以防止汽水冲击。