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问题 单项选择题

细胞毒性T细胞的作用（）

A.具有ADCC效应

B.直接杀伤靶细胞

C.杀伤靶细胞不受MHC限制

D.无抗原特异性

E.具有吞噬作用

答案

参考答案：B

解析：细胞毒性T细胞直接杀伤靶细胞具有抗原特异性，且受MHC限制，不具ADCC作用。

单项选择题

Jason Blackwell, CFA, works as an investment manager for Mega Capital, a large multinational brokerage firm. He resides in a country whose applicable law is stricter than the Code and Standards but does business with clients in a country whose applicable law is less strict than the Code and Standards. Blackwell decides to follow the Code and Standards for clients in the less strict country. While Blackwell is still employed at Mega, Lego Associates verbally asks Blackwell to review client portfolios during evenings and weekends for a fee. Blackwell gets consent from his immediate supervisor at Mega to undertake this independent activity for a one - month trial basis. Which of the following statements about Blackwell’s actions involving Standard Ⅰ, Professionalism, and Standard IV(A), Loyalty is most accurate Blackwell:（）

A. did not violate either Standard Ⅰ or Standard Ⅳ (A).

B. violated both Standard Ⅰ and Standard Ⅳ (A).

C. violated Standard Ⅰ but did not violate Standard Ⅳ (A).
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单项选择题

机械在具体施工条件下连续工作的生产率是（）。

A.理论生产率

B.技术生产率

C.实际生产率

D.设定生产率
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