食物因素中,对致龋最有影响的物质是()
A.蔗糖
B.乳糖
C.蛋白质
D.维生素
E.氨基酸
参考答案:A
Banz and Reinganum found that small firms consistently outperformed large finns. This anomaly is referred to as the:()
A. growth effect.
B. P/E effect.
C. size effect.
冬季残液温度要求不低于多少度?低时如何处理?