颌面部发育的第三快速期为 （）
A.7～8岁
B.8～9岁
C.9～10岁
D.10～11岁
E.11～13岁
参考答案：E
How long are you staying there?
-----______,but I will try to be back as soon as possible.
A．It all depends.
B．It doesn’t matter.
C．Every three weeks.
D．Not very long.
梁柱的长度方向通常以端面或底板作为基准。( )
