问题 问答题 简答题

超声波探伤仪的作用是什么?

答案

参考答案:

超声波探伤仪是超声波探伤的主体设备。

它的主要作用是产生电振荡并加于探头晶片,激励晶片发射超声波;同时将探头接收回的电信号进行放大,通过一定方式显示出来,从而得到被探工件内有无缺陷及缺陷的位置和大小等信息。

阅读理解

One day a big cat was going into a forest to find something to eat. On his way he met his friend, the old owl(猫头鹰).  The owl greeted him, “Good morning, my dear friend. Where are you going?”  “I’m going to the forest to look for some birds to eat.” The cat answered. “But be careful not to catch any of my children.” The owl said to the cat. “OK,” the cat said. “But what do your children look like?” “Oh,” the owl said, “they are the most beautiful birds in the forest.”

“All right, I know that.” The cat said and walked on to the forest.

The cat entered the forest and saw many beautiful birds here and there. He remembered what the owl had told him and went away. Then after a long time, he saw some ugly birds in a nest. He sat down and ate them one by one. When the owl came back to her nest, she found it was empty.

小题1:The cat went to the forest            .

A.to meet his friend

B.because he was hungry

C.to see the tree

D.to visit the owl小题2:The old owl        the cat.

A.knew

B.ate

C.didn’t like

D.didn’t see小题3: When the cat saw the beautiful birds, he           .

A.didn’t eat any of them

B.ate only a few of them

C.caught some but let them go

D.ate all of them小题4:The old owl’s children were           .

A.beautiful

B.ugly

C.nice to the cat

D.the cat’s friends小题5:The owl’s nest was           .

A.near the cat’s home

B.in a small tree

C.on the ground

D.in the forest

阅读理解

Death Valley is a land of beautiful yet dangerous extremes. Death Valley can be dangerously cold during the winter months. Storms in the mountains can produce sudden flooding on the floor of the Valley.

The air temperature during the summer has been as high as fifty- seven degrees Celsius. The sun can heat the ground so that the temperature of the rocks and soil can be as high as seventy -four degrees Celsius.

Death Valley contains evidence of several ancient volcanoes that caused huge explosions. Evidence of one of these explosions is called Ubehebe Crater. The explosion left a huge hole in the ground almost a kilometer and a half wide. In many areas of Death Valley it is easy to see where the ground has been pushed up violently by movement deep in the Earth. This movement has created unusual and beautiful rock formations. Some are red. Others are dark brown, gray, yellow or black.

The area was named by a woman in 1849. Thousands of people from other parts of the ountry traveled to the gold mining areas in California. They were in a hurry to get there before other people did. One group trying to reach California decided to take a path called the Old Spanish Trail. By December they had reached Death Valley.  They did not have to survive the terrible heat of summer, but there was still an extreme lack of water. There were few plants for their work animals to eat.

The people could not find a pass through the tall mountains to the west of the Valley, Slowly, they began co suffer from a lack of food. To survive, they killed their work animals for food and began to walk out of the Valley. As they left, one woman looked back and said, "Good -bye, death valley. ” The name has never been changed.

Almost everyone who visits Death Valley visits a huge house called Scotty' s Castle. The building design is Spanish, with high thick walls to provide protection from the fierce heat.

The castle is named for Walter Scott , called Scotty. by his friends. He was a gold miner. He told everyone that he built the house with money he made from his gold mine. Many people believed him. But it was not really the truth.

小题1: The first two paragraphs discuss Death Valley' s ________.

A.geography

B.climate

C.location

D.size小题2:The volcanoes mentioned in the third paragraph proved ________.

A.a valley that is formed by explosions

B.a place where volcanoes are still active

C.a good example of the violence of nature

D.a symbol of rock formations in history小题3:The woman who named Death Valley intended to ________.

A.explore the mystery of the valley

B.find an area with plants for animals

C.experience the terrible heat of summer

D.look for gold in California小题4:If the passage continues, it will be about ________.

A.the truth about Scotty's Castle

B.why Spanish built the castle

C.when the castle was built

D.where the castle lies in小题5:The main idea of the passage is about ________.

A.the interesting place in Death Valley

B.the facts about Death Valley

C.the origin of Death Valley

D.the route to visit Death Valley