问题 问答题

刮削大型精密平板,用平行桥板和分度值为0.02mm/1000mm水平仪测得各段的直线度误差值(见图5),试仿照第六章图6-41作出各段的直线度误差曲线图,求出各测量段的最大误差值,并分析该平板的最大误差集中在哪一段。

答案

参考答案:

求分级尺寸AK1、AK2

因 A0max=A1max-(A2max+A3max+A4max+A5max)-AK1min

故AK1min=105.06mm-(24.97+24.97+24.97+19.97)mm-0.30mm

=9.88mm

分级差为T0-TK=(0.24-0.06)mm=0.18mm

答 调整件分2级,分级尺寸为AK1=;AK2=

阅读理解
阅读理解。
     阅读下面短文,根据所读内容在表格中的空白处填入适当单词。注意:每个空格只填一个单词。
     Nowadays more and more people are concerned about their health, but how to keep healthy? Different people may give different answers to this question. In my opinion, it is essential to do the following.
     First, it is absolutely necessary to take some exercise at regular time every day. Research shows that
getting plenty of exercise can make the heart beat faster and the lungs work harder. This strengthens the
heart, reduces the chance of heart attack, and helps lower blood pressure. That's why more and more
people are becoming active in various kinds of sports and exercise. Every morning many people get up
early and take much exercise. Some play ball games while others run, jog, walk or dance to music. In the
afternoon, there are also many people keen on sports. Through sports and exercise, people become
healthier and stronger.
     Medical researchers have proved that what people eat affects their health. They advise people to
eat more fruit and vegetables and less meat such as beef and pork because meat contains more fat than
poultry (家禽) and fish. Fat can build up in the arteries (动脉), block the flow of blood, and cause a heart
attack or stroke (中风).
     Getting rid of bad habits like smoking and drinking alcohol is also an important way to keep healthy.
Smoking and drinking alcohol injure one's health a great deal, and therefore should be
given up. Unfortunately few people follow this advice.
Best title: How to keep 1._____
TipsDetails
Take some exercise  2.____ 
Benefits of plenty of exercise:
The heart can be   3._____    ;
The chanceof heart attack can be   4._____ ;
Blood pressure can be    5._____    .
Pay attention to your6._____   7.____  Suggestions:Fat can result in a heart attack or stroke;
More fat may be   8._____    in meat.
To eat more fruit and vegetables;
To eat less meat such as beef and pork.
Give  up  bad habitsHarm of bad habits: smoking and drinking alcohol do 9.____ to one's health.
Advice: Getting rid of bad habits like smoking and drinking.
10._____If people follow these ways, they will greatly improve their health.
单项选择题 A1/A2型题