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【多选题】
下列化合物中含有碳原子的有?A.
2- 甲基丁烷
B.
2,2- 二甲基丁烷
C.
2,3- 二甲基丁烷
D.
2,2- 二甲基
E.
2,4- 二甲基
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皮皮学刷刷变学霸
举一反三
【单选题】Which of the following is the main purpose of the text?
A.
To prove that people think that Coke is tastier than Pepsi.
B.
To show that scientists are doing experiments on how people's brains work.
C.
To show that Coke advertising is more effective than Pepsi advertising.
D.
To prove that most people cannot tell the difference between Coke and Pepsi.
【单选题】The people of that village mostly live a long life, about seventy-five years of age _____.
A.
to the day
B.
on end
C.
in some cases
D.
on the average
【单选题】________ as one, the people of that country eventually drove the invaders (侵略者)out of their country.
A.
Linked
B.
Combined
C.
Joined
D.
United
【多选题】大学生群体是一个特殊的社会群体，自身的特点有：()
A.
生理发育基本成熟而心理发育相对滞后
B.
个性趋向定型，但可塑性大
C.
智力接近高峰，但尚未完全开发
D.
社会需求强烈，但经验不足，缺乏必要的社会经验，安全防范意识较差，自我防范能力较弱
【简答题】fourth
【简答题】fourth
【简答题】低碳钢试件在拉伸和扭转时的的破坏形式是否一样?引起试件破坏的因素是什么?
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