患者A区第一前磨牙Ⅲ度松动,牙周袋溢脓,牙周袋深7mm,治疗方案为()。
A.拔除
B.龈上洁治术+龈下洁治
C.切龈术
D.翻瓣术
E.抗生素治疗
参考答案:A
发声体做无规则振动时发出的声音叫______.从环境保护的角度看,凡是妨碍人们正常休息、______和______的声音,以及对人们要听的声音产生干扰的声音都属于______.
Although the old lady has a daughter and two sons, ____ live with her. [ ]
A. none of whom
B. neither of them
C. all of whom
D. none of them