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问题 单项选择题

某男性患者，43岁，缺失，作可摘局部义齿修复，基牙靠近缺隙侧倒凹大，这种情况下，上可设计（）。

A．锻丝上返卡环

B．锻丝下返卡环

C．单臂卡环

D．固定卡环

E．环形卡环

答案

参考答案：A

单项选择题

在刀具半径补偿模式下改变补偿值时，将出现（）。

A.机床继续运动，但是刀具半径补偿被取消

B.机床处于报警状态

C.机床按新补偿值进行刀具半径补偿

D.新补偿值被加到原有数值上
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单项选择题

Some anthropologists study modern-day societies of foragers in an effort to learn about our ancient ancestors who were also foragers. A flaw in this strategy is that forager societies are extremely varied. Indeed, any forager society with which anthropologists are familiar has had considerable contact with modern nonforager societies.
Which of the following, if true, would most weaken the criticism made above of the anthropologists’ strategy

A．All forager societies throughout history have had a number of important features in common that are absent from other types of societies.

B．Most ancient forager societies either dissolved or made a transition to another way of life.

C．All anthropologists study one kind or another of modernday society.

D．Many anthropologists who study modern-day forager societies do not draw inferences about ancient societies on the basis of their studies:

E．(E) Even those modem-day forager societies that have not had significant contact with modern societies are importantly different from ancient forager societies.
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