金属全冠初戴就位困难的主要原因哪项不对
A．接触点过紧
B．组织面有小结节
C．基牙上有倒凹
D．基牙表面过于粗糙
E．铸件变形
参考答案：D
We're going to mountains tomorrow. [ ]
A. climb
B. climbed
C. climbing
A．
B．
C．
D．
