CD4/CD8比值降低见于()
A.变态反应
B.艾滋病
C.病毒性感染
D.自身免疫性疾病
E.恶性肿瘤
参考答案:B
根据首字母或汉语提示完成单词
小题1:Now e (电的)bikes have become more and more popular.
小题2:They are c (疯狂的) about dancing and singing.
小题3: My father works in a big foreign c (公司).
小题4: The building was d (毁坏) by the fire.
小题5:She is s (害怕) of the snake.
如图所示,电磁铁P和Q通电后
A.P的右端是N极,Q的左端是S极,它们相互吸引
B.P的右端是S极,Q的左端是S极,它们相互排斥
C.P的右端是N极,Q的左端是N极,它们相互排斥
D.P的右端是S极,Q的左端是N极,它们相互吸引