【简答题】在关闭未保存的文档时,系统将打开是否进行保存提示对话框,如果要保存可单击()按钮,如果不保存单击()按钮,如果不关闭文档单击()按钮。
【多选题】送站服务是旅游者在旅游目的地所接受的最后一项服务,下列选项属于送行前业务的是( )
【单选题】早在19世纪末有医生发现,癌症患者手术后意外感染酿脓链球菌,其免疫功能增 强、存活时间延长,从而开启了 "癌症免疫疗法”的大门。"癌症免疫疗法”是指通过自身免疫系统来抗击癌细胞的疗法。下列相关叙述正确的是
A.
患者免疫功能增强是因为酿脓链球菌侵入癌细胞使其裂解死亡
B.
酿脓链球菌激活患者的非特异性免疫功能从而消灭癌细胞
C.
癌症免疫疗法主要是通过增强患者的细胞免疫功能来杀死癌细胞
D.
癌症免疫疗法通过改变癌细胞的遗传信息来达到治疗目的
【单选题】Nick considers macaroni and cheese to be an inferior good. As a result of macaroni and cheese being an inferior good, the
A.
substitution effect must be larger in magnitude than the income effect so that less is purchased as the price falls.
B.
substitution effect must be smaller in magnitude than the income effect so that less is purchased as the price falls.
C.
income effect is positive, so that more is purchased as income increases.
D.
income effect is negative, so that less is purchased as income increases.
【简答题】A.constructs B.convinces C.conceals D.considers
【单选题】目前,我国暴露后预防用于HIV职业暴露人群,预防性用药需连续服药多长时间( )
【多选题】送站服务是旅游者在旅游目的地所接受的最后一项服务,下列选项属于送行前业务的是( )