关于溺水治疗错误的是()
A.迅速清除口鼻内的污物
B.采取头低腹卧位进行引流
C.心肺复苏应该最先进行
D.有条件气管插管
E.防止呕吐物进入气道
参考答案:C
年轻人的弥漫性单纯性甲状腺肿,如无症状,其治疗首先考虑()。
A.甲状腺次全切除术
B.多食含碘的海带、紫菜
C.小量甲状腺素
D.131I治疗
E.无需治疗
Which of the following is least likely to be considered a reason for the existence of a natural monopoly()
A. Firms that can maximize profit when price equals marginal cost.
B. Firms that have significant economies of scale.
C. Firms that have significant economies of scope.