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【简答题】
Argument 2: 1.It was initially believed that young children could not understand other people’s points of view or undertake tasks such as counting and measuring until they were at least seven years of age. 2. However, it seems the problem does not lie in children’s capacity to do these things so much as in their understanding of what is being asked and why. 3. If there is no obvious purpose, or they do not understand the language used, children find tasks difficult. 4. Even young children can perform tasks formerly considered too advanced for them, as long as these are set up in ways that make sense to them. 5. Problems that involve teddies or drinks, for example, may be meaningful to a very young child, whereas tasks with counters and beakers are not. 2. The position : ___________
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【单选题】常用于有机合成中保护醛基的反应是
A.
醛和亚硫酸氢钠加成
B.
醛和苯肼加成
C.
醛和氢氰酸加成
D.
醛和醇加成
【多选题】What conditions must be satisfied when the structure is in equilibrium?
A.
The reactions must equal zero.
B.
The sum of the horizontal components must equal zero.
C.
The sum of the vertical components must equal zero.
D.
The sum of the moments must equal zero.
【多选题】羚羊角的鉴别特征有
A.
具“通天眼”
B.
具“羚羊塞”
C.
全角呈半透明
D.
髓管呈长管形,基本角质细胞为长菱形
E.
色素颗粒较少
【多选题】羚羊角的鉴别特征有(      )
A.
具“通天眼”
B.
具“骨塞”
C.
外表光滑,半透明
D.
嫩枝对光透视有“血丝”
【单选题】在有机合成反应中常用于保护醛基的反应是
A.
醇醛缩合反应
B.
碘仿反应
C.
缩醛的生成反应
D.
Cannizzaro 反应
【多选题】羚羊角的鉴别特征有()
A.
具“通天眼”
B.
具“羚羊塞”
C.
外表光滑,透明或半透明
D.
磨片镜检髓管呈长管形,内有梯状排列或疏松排列的髓细胞
【判断题】( )“清洁生产是指食品行业的企业必须注意生产环节的清洁工作,以保证为客户提供安全卫生的食品。”
A.
正确
B.
错误
【简答题】what is the structure in thymus?
【单选题】有机合成中常用于保护醛基的反应是( )
A.
羟醛缩合反应
B.
坎尼扎罗反应
C.
碘仿反应
D.
缩醛反应
【多选题】羚羊角的鉴别特征有
A.
具“通天眼”
B.
具“羚羊塞”
C.
外表光滑,透明或半透明
D.
磨片镜检髓管呈长管形,内有梯状排列或疏松排列的髓细胞
E.
色素颗粒较少
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