颊侧近中倾斜、远中孤立的上颌磨牙,放置圈形卡环时卡臂应位于
A.颊侧远中倒凹区
B.颊侧近中区
C.远中邻面
D.舌侧远中倒凹区
E.舌侧近中侧凹区
参考答案:D
室间隔缺损不易发生的并发症为()。
A.肺炎
B.细菌性心内膜炎
C.心力衰竭
D.脑栓塞
E.肺水肿
Our country is quite different from _____ twenty years ago. [ ]
A. that it was
B. what it was
C. it was that
D. what was it