根管机械预备的目的如下,除外()
A.清除主根管内感染
B.清除根管壁的感染
C.扩大根尖孔以利引流
D.减少弯曲根管的弯曲度
E.预备根管形态以利充填
参考答案:C
(2014·江苏省三校4月阶段性考试)To their disappointment,Dr Wang gave a speech about the economy without even a passing________to the problem of unemployment.
A.connection
B.appointment
C.reference
D.exploration
预防性驱虫