Questions 19 to 21 are based on the passage you have just heard.
A. Trucks took all the new business.
B. The rail industry didn"t have strict regulations.
C. The damage to products by freight trains was serious.
D. Companies reduced their lines greatly.
查看答案
下列哪一项不是I型超敏反应的特点
A. IgE介导
B. 发生速度快
C. 有明显个体差异
D. 引起功能紊乱
E. 造成组织损伤
Th细胞独有的分化抗原是
A. CD2
B. CD3
CD4
D. CD8
E. CD28
下列哪种细胞因子不是由单核吞噬细胞产生的
A. IL-1
B. IL-2
C. TNF-α
D. INF-α
E. TNF-β
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