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.()
Television gets much of its financial source from advertising and is by nature more Republican than the newspapers.()
Psychology, philosophy, and anthropology are all concerned with the study of meaning.()