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【单选题】
创建b_ser=pd.Series(10,[‘a’,’b’,’c’])， 则b_ser的值包含数据的个数为：A.
0
B.
1
C.
2
D.
3
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反馈参考答案：
举一反三
【单选题】琥珀胆碱的肌松作用机制是:
A.
使ACh合成和释放减少
B.
使ACh合成和释放增加
C.
激活胆碱酯酶，使ACh破坏增多
D.
直接与N2-受体结合，引起类似ACh的除极化，使ACh不能兴奋终板
【单选题】听力原文：M: How much are the carnations and tile roses? W: One dollar for each carnation and (9)one and a half for each red rose. M: (9)Then I'd like a dozen red carnations and half a dozen red roses. W: ...
A.
Birthday of the man's mother.
B.
Mother's Day.
C.
Mother's Day and the birthday of the man's mother.
D.
Mother's Day and the lady's birthday.
【单选题】Over time, Steven Spielburg gained fame as a Hollywood director and ____ in the film industry.
A.
made it big
B.
come out with
C.
find out
D.
take control
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