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【单选题】
产生 CD4 + T细胞活化的第2信号分子是A.
CD8与MHC-Ⅰ类分子
B.
CD2与IgG
C.
CD4与MHC-Ⅱ类分子
D.
CD28与B7
E.
TCR与CD3
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举一反三
【单选题】According to the passage, what makes acquisitions easier?
A.
The changing technology employed by the media.
B.
The media's increasing profits in the marketplace.
C.
The ever tougher regulations of the FCC on the media since 1980.
D.
The availability of the media's stocks on stock exchanges.
【简答题】Sa mère est-elle aussi professeur?
【简答题】5)Sa mère est-elle aussi professeur?
【单选题】听力原文：M：If you are not so careless, you can get better scores. W: Come on, easier said than done. Q: What does the woman mean? (17)
A.
The exam was easier than before.
B.
It is hard to get a high mark in the exam.
C.
She is sure that she will do it better in the next exam.
D.
The man got a bad scores.
【简答题】AT89S51 单片机定时器的四种工作方式中,方式 0 为 位计数器,方式 1 为 位计数器
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