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问题 单项选择题

烤瓷桥试戴咬合时发生崩瓷

A．基底冠内有小瘤子
B．冠边缘蜡型修整不准确
C．基牙预备量不足或不均
D．桥体两侧基牙无共同就位道
E．蜡型变形

答案

参考答案：C

解析： 基牙预备量不足可导致瓷层厚度不足。基牙预备量不均可导致金属与瓷厚度不均，比例不协调而引起收缩膨胀不一，引起瓷崩。

问答题 简答题

土地利用管理的核心是什么？
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单项选择题

Digital computer is controlled by internally stored programs and (66) of using common storage for all or part of a program and also for all or part of the data necessary for the execution of the programs; executing user-written or user-designated programs; performing user-designated manipulation of digitally represented discrete data, including. (67) operations and logic operations; and executing programs that (68) themselves during their execution.

Analog computer’s operations are analogous to the (69) of another system and that accepts, processes, and produces analog data.

(70) computer integrates analog computer components and digital computer components by interconnection of digital-to-analog converters and analog-to-digital converters.

（69）处填（）。

A．behavior

B．action

C．conduct

D．manner
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