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铸造全冠的特点

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选用于最后孤立，并向近中舌向倾斜的下颌磨牙的卡环是

Section B
Directions: This section is to test your ability to understand short dialogues. There are 5 recorded dialogues in it. After each dialogue, there is a recorded question. The dialogues and questions will be spoken two times. When you hear a question, you should decide on the correct answer from the 4 choices marked A, B, C and D.
(6)

A. In France.
B. In the U.S.A.
C. In Japan.
D. In China.

试题基于以下的5阶B树结构，该B树现在的层数为2。从该B树中删除关键码15后，该B树的第2层的结点数为2。

A. 6
B. 7
C. 8
D. 9

AST的底物是