在油脂中常用的三种抗氧化剂()、()、()。
参考答案:(PG)、(BHT)、(TBHQ)或(BHA)
— What did you do on May Day?
— I went shopping with my family. There _____ so many people in the street. [ ]
A. was
B. are
C. were
患者男性,8岁,因“上颌后部牙龈肿”来诊。口腔检查:乳牙右上4远中邻洞,叩诊不适,松动Ⅱ度,牙龈红肿。X线片:乳牙右上4根分叉及根尖暗影,牙根吸收。
最可能的诊断是()
A.龋
B.牙髓炎
C.根尖周炎
D.牙龈炎
E.牙周炎