以下哪项不是预防矫治后复发的方法 （）
A.早期矫治
B.牙齿矫治恰好到位
C.永久性保持
D.正颌外科
E.口腔不良习惯的破除
参考答案：B
What did the author think of his mother
A．She was stubborn.
B．She was p.
C．She did not care him very much.
D．She was not very intelligent.
施工安全管理目标中的“三消灭”是指消灭“违章指挥”、消灭“违章作业”和消灭( )。
A．“惯性事故”
B．“触电事故”
C．“因公受伤”
D．“死亡事故”
