The discovery of_in 1921 was one of the greatest medical breakthroughs in Endocrinology()
A. penicillin
B. insulin
C. Prontosil
D. vaccines
Chinese tuina is a type of therapeutic massage, used to treat muscle or joint pain and other ailments()
平面一般力系可以列出()个独立的平衡方程
A. 1
B. 2
C. 3
D. 6
蛋白质的高级结构及功能决定于()
A. 分子中氢键
B. 分子中盐键
C. 氨基酸的组成和排列顺序
D. 分子内部疏水键