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
Questions 12 to 15 are based on the conversation you have just heard.
A. We ourselves take the responsibility.
B. We find fault with other people.
C. We blame it for external factors.
D. We complain about our personal problems.
简述第二次产业革命时期国际分工体系最终确立的具体表现。
(2008年)模型与原形采用相同介质，为满足黏性阻力相似，若几何比尺为10，设计模型应使流速比尺为( )。
A. 10
B. 1
C. 0．1
D. 5
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