不宜用作嵌体修复的材料是（）。
A.复合树脂
B.自凝塑料
C.烤瓷
D.铸造陶瓷
E.金属
参考答案：B
Traversing a binary tree in preorder is equivalent to
A． Traversing the forest corresponding to the binary tree in root-first order.
B． Traversing the forest corresponding to the binary tree in root-last order.
C． Traversing the forest corresponding to the binary tree in breadth-first order.
D． None of the above.
背胰形成或参与形成（）。
A.胰头
B.胰体
C.胰尾
D.胰头下份
