恒中切牙萌出后,牙冠表面有一白垩色斑块,采用( )
A. 窝钩封闭
B. 氟化物防龋
C. 使用洗必泰漱口液
D. 预防性树脂充填
E. 定期口腔检查
我国食品中的 允许量规定代乳食品( )
A. ≤ 10/kg
B. ≤ 10/kg
C. ≤ 10/kg
D. ≤ 10/kg
E. 不得检出
木瓜酶水解的片段是( )
A. 2Fab段+Fc段
B. 绞链区
C. 可变区
D. 稳定区
Buck learned to survive in the arctic by ______.
A. its primitive character
B. becoming the strongest
C. the law of club and fang
D. adapt itself to the cold arctic