单项选择题
A.25% B.30% C.40% D.50% E.75%
A.2~3倍 B.4~9倍 C.10~15倍 D.16~20倍 E.>20倍
A.低血压 B.心脏阻滞 C.支气管哮喘 D.机械性肠梗阻或尿路梗阻 E.重症肌无力