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【单选题】
在Excel中,在单元格中输入公式时,输入的第一个符号是A.
sheet1
B.
Book1
C.
chart1
D.
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皮皮学刷刷变学霸
举一反三
【单选题】关于 CD8 分子的作用,叙述错误的是:
A.
能与MHC-Ⅰ分子非多态区结合
B.
增强 Th 细胞与靶细胞的结合
C.
参与抗原刺激 TCR-CD3 信号转导
D.
参与 T 细胞在胸腺内的分化
【单选题】听力原文：M: Any interesting jobs listed on the Internet today? W: Well, there are a lot of retail jobs—selling clothes and stuff. But you have to work Saturdays and Sundays. M: Hmm. I hate working on week...
A.
Reading newspapers.
B.
looking for jobs.
C.
Surfing the Internet.
【单选题】听力原文：W: Do you think the history course is interesting? M: Yes, but it is very difficult. I'll never get through the reading list. Q: What can we learn from the man's reply? (14)
A.
The man finds the history course too difficult for him.
B.
The man finds the history course very interesting and rewarding.
C.
The man finds the history course very easy and interesting.
D.
The man finds the history course interesting but demanding.
【简答题】已知电路如图a所示，U S1 =10V，R 1 =1kΩ，R 2 =2kΩ，试求ab端戴维南等效电路。
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