替牙期矫治适应症有 ()
A.前牙反牙合
B.后牙反牙合、锁牙合
C.个别牙严重错位
D.上下牙弓关系错乱
E.上中切牙间隙在侧切牙已萌出而未关闭者
参考答案:A, B, C, D
— How are you getting on with your lessons?
— Much . I can do well in the final examination.
A.good
B.better
C.best
D.well
当日航班直接准备阶段必须进行航前安保协同。()