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成人双上肢全皮层烧伤，其烧伤严重性分度为（）E．

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在图示三个振动系统中，物块的质量均为 m，弹簧的刚性系数均为k，摩擦和弹簧的质量不计。设图(a)、(b)、(c)中弹簧的振动频率分别为f1、f2、f3，则三者的关系为()。

A. f1=f2≠f3
B. f1≠f2=f3
C. f1=f2=f3
D. f1≠f2≠f3

In addition, Froebel was concerned that the spread of industrialization would negatively affect the family, but he believed that______.

A. kindergartens could increase the social ability of mothers and children
B. kindergartens were associated with liberalism and free-thinking
C. they would not be banned by the Prussian government in the future
D. kindergartens could increase the social position of mothers and children

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How many times does an average American housewife go to the supermarket each week？

A. Once.
B. Twice.
C. Three times.

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In the sentence "The South was controlled by Vietnamese who had collaborated with the French. ", "collaborate" means______.

A. work together
B. deal with
C. operate with
D. labor with

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