问题 问答题 简答题

CSK—1A试块能测试探伤仪和探头的哪些指标?

答案

参考答案:可测试下列指标:

⑴利用厚度25mm测定探伤仪的水平,垂直线性和动态范围。

⑵利用厚度25mm和高度100mm调整纵波探测范围。

⑶利用R50和R100校定时基线或测定斜探头的入射点。

⑷利用高度85mm、91mm、100mm测定直探头的分辨力。

⑸利用Φ40、Φ44、Φ50曲面测定斜探头分辨力。

⑹利用Φ50曲面和Φ1.5横孔测定斜探头K值。

⑺利用Φ50有机玻璃块测定直探头盲区和穿透力。

⑻利用高度91mm(纵波声程相当于横波50mm),调节横波1:1扫描速度,配合R100作零位校正。

⑼利用试块直角棱边测定斜探头的声轴偏斜角。

阅读理解

Deserts(沙漠)do not stay the same size (形状).Sometimes they grow bigger. Sometimes they get smaller. The world’s biggest desert, Sahara, is in Africa. Right now, the Sahara desert is growing fast.

Why is the Sahara growing ? In some places , People farm too much.  In other places ,animals eat all the grass. or people cut down the trees. This makes the soil(土壤) weak. Weak soil lets the desert grow.

Why is it a problem? people can not grow food in the desert. people can not build houses, hospitals , or schools in the desert . so people must leave their homes .They must live somewhere else.

What can people do ? They can plant trees. They can also farm less. These things make soil stronger. maybe the Sahara will stop growing . It’s a big problem. Many people must work together to solve (解决) it?

小题1:What is the main idea ?(中心思想)

A.The Sahara Desert is in Africa .

B.Farming too much makes the soil weak.

C.Big problem are caused (引起) by the growing Sahara desert.

D.Planting trees will help the world.小题2:The Sahara is growing .Which of these things is not a reason(理由)?

A.Building homes

B.Farming too much

C.Animals eating the grass

D.Cutting down trees小题3:What do we know about deserts ?

A.Their size never changes

B.They are caused by people

C.They can make trouble for people

D.They are all in Africa.小题4:Planting trees can   

A.make the soil weaker

B.help people farm less

C.be good for the soil

D.make the Sahara grow.小题5:Stopping growing the desert

A.is easy

B.takes a lot of people

C.is not a big problem

D.is not important

单项选择题