后牙中性、前牙反的矫治原则为()。
A.缩小牙弓或结合修复治疗
B.扩大牙弓,推磨牙向后,减径或减数
C.矫治前牙深覆盖
D.肌能训练矫治法
E.以上都不是
参考答案:E
What happened to the city after the mass move
A.Housing costs decreased.
B.Crime rate was much lower than before.
C.All business moved out.
D.Cities declined.
《信息交换用汉字编码字符集·基本集》中的汉字根据其使用频率分为两级。( )