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According to one rock music critic, the teenagers express their rebellious attitudes

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The smallest meaningful unit of language is called a morph.()

分光光度法的吸光度与什么无关

A. 人射光的波长
B. 液层的高度
C. 液层的厚度
D. 溶液的浓度
E. 电压

蛋白质一级结构的化学键主要是

A. 共价键
B. 盐键
C. 氢键
D. 肽键
E. 疏水键

Primitive men, due to lack of such entertainments as modern men have, easily got bored.()