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【单选题】
为比较某地两年几种疾病的患病率, 可采用:A.
直方图
B.
复式直条图
C.
线图
D.
百分条图
E.
圆图
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反馈参考答案：
举一反三
【多选题】关于本征半导体和杂质半导体描述正确的是
A.
本征半导体导电能力很强。
B.
N型杂质半导体中的多子是自由电子。
C.
本征半导体掺入三价元素后变成N型半导体。
D.
掺杂过程中，五价元素称为施主杂质，三价元素称为受主杂质
【简答题】In what area does he lack experience? He has no experience in_________
【简答题】What qualities and experience will you need to _______ for the job?
【单选题】What concern was raised from the experience of purchasing jeans?
A.
It wasn't a complicated transaction before.
B.
It shouldn't have been so tiring and troublesome.
C.
The store has more varieties to choose from.
D.
The store should provide more information
【单选题】what experience do you have?
A.
： My major is Business Administration.
B.
： Yes. I received my Bachelor degree in English Literature.
C.
： Project Management.I was very interested in this course when I was a student.
D.
： I worked in a foreign office for one year.
E.
． I like to be paid more than 5000 yuan.
F.
I would rather work full-time.
【简答题】What was the most choking experience for her during the match?
【简答题】下述说法中，正确的是( )． A．本征半导体是电子与空穴两种载流子同时参与导电．而杂质半导体(N型或P型)只有一种载流子(电子或空穴)参与导电，所以本征半导体导电性能比杂质半导体好 B．N型半导体的导电性能优于P型半导体，因为N型半导体是负电子导电，P型半导体是正离子导电 C．N型半导体中杂质原子所形成的局部能级靠近导带的底部，使局部能级中多余的电子容易被激发跃迁到导带中去．大大提高了半导体...
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