互成平衡的一对力对同一点之矩的()
A. 代数值相等
B. 转向相同
C. 和等于零
D. 无法确定
蛋白质的基本组成单位是()
A. 肽键平面
B. 核苷酸
C. 肽
D. 氨基酸
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()