在泵出口设有旁路与吸液罐相连通，改变旁路上调节阀的开度调节流量属于（）。 ["改变管路特性工况调节","改变工艺参数调节","改变尺寸参数调节","改变泵特性工况调节"]
确诊血友病的检查是（） ["肾上腺素试验","凝血活酶生成及纠正试验","D-二聚体测定","血小板聚集试验","毛细血管脆性试验"]
霍乱的重要预防措施是（） ["接种疫苗","对密切接触者进行检疫","管好食品","隔离患者","开窗通风"]
熵
病毒复制活跃的标志是（） ["HBsAg","抗-HBs","抗-HBcIgG","抗-HBcIgM","抗-HBe"]
免疫原性的基础有哪些？
