传染病预防中针对易感人群的措施是
A.隔离、留验、医学观察、应急接种等B.预防接种、药物预防、个人防护C.疾病监测D.三级预防E.消毒、杀虫
参考答案:B
She usually _____ three times a week.[ ]
A. exercise
B. exercises
C. to exercise
D. exercised
婴儿生后2~3个月时红细胞数降至3.0×1012/L,血红蛋白量降至110g/L,此时出现的贫血是
A.生理性贫血B.溶血性贫血C.营养性缺铁性贫血D.营养性巨幼红细胞性贫血E.再生障碍性贫血