属于等张液体的是()。
A.5%碳酸氢钠溶液
B.0.9%氯化钠溶液
C.1:1液
D.10%葡萄糖溶液
E.口服补液盐(ORS)溶液
参考答案:B
艾滋病人肺部感染最常见的病原体是()
A.巨细胞病毒
B.卡氏肺孢子菌
C.弓形虫
D.念珠菌
E.疱疹病毒
The free-rider problem, an obstacle to efficiency, is most likely associated with:()
A. monopolies
B. public goods
C. subsidies and quotas