对半卡环适用于()
A.Ⅰ类导线
B.锥形牙
C.游离缺失的末端基牙
D.孤立的前磨牙、磨牙
E.前牙缺失的病例
参考答案:D
We expect her to do the housework as well _________ after the children.
A.as look
B.as looking
C.and look
D.Looking
楼板层由结构层、顶棚两个基本部分组成。( )