患者右上颌缺失，前部牙槽嵴欠丰满，组织倒凹明显，无接触点、食物嵌塞。

模型向后倾斜使就位道为从前下向后上有以下作用，除了（）

A.减小牙槽嵴唇侧倒凹

B.减小人工牙与余留牙之间的间隙

C.使就位道与脱位方向不一致，从而获得制锁作用

D.增大双侧7颊侧远中倒凹

E.便于义齿的就位

XML is a (71) language for documents containing (72) information.

Structured information contains both content(words, pictures, etc.)and some indication of what role that content plays(for example, content in a section heading has a different meaning from content in a footnote, which means something different than content in a figure caption or content in a database table, etc.). Almost all documents have some structure.

A markup language is a (73) to (74) structures in a document. The XML specification defines a standard way to add markup to (75) .

（73）处填（）。

A．algorithm

B．arithmetic

C．mechanism

D．mechanistic