钉洞固位形不可设计在
A．后牙牙尖处
B．前牙舌面窝近舌隆突处
C．前牙舌面切嵴与近远中边缘嵴交界处
D．后牙牙尖间的沟窝处
E．死髓牙的胎面
参考答案：A
Great changes have taken place in that school, it is no longer ________ it was 20 years ago, ________ it was so poorly equipped.
A．what; when
B．that; which
C．what; which
D．which; that
下面不属于不可抗力事故的是（）
A.地震
B.火灾
C.暴风雨
D.偷盗
