新投产的液化石油气贮罐或大修后的贮罐在投产前必须对贮罐内的空气进行()方能输入液化石

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问题:

新投产的液化石油气贮罐或大修后的贮罐在投产前必须对贮罐内的空气进行()方能输入液化石油气。

A.置换

B.放散

C.加水

D.加压

考点:气瓶作业液化石油气瓶充装液化石油气瓶充装题库
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二尖瓣位于()

A.肺动脉口

B.右房室口

C.左房室口

D.主动脉口

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骨折愈合过程中的血肿机化期,骨样组织来源于()。

A.外骨膜深层

B.内骨膜深层

C.骨断端

D.干骺端

E.以上都不是

题型:单项选择题

In 1879, a group of explorers made an incredible find. They discovered paintings of remarkable beauty on the walls of a cave in Spain. Some scientists believed that these paintings were created by early humans from the Stone Age, between ten and thirty thousand years ago. Other scientists and the public did not believe the claim, but over the years, it was proven correct. Our ancestors had incredible artistic talents.

Most of the cave art that has been discovered has been found in Spain and France. A smaller number of such caves are located in Italy, Portugal, Russia, and other countries. Scientists believe that many more caves will be discovered in the coming years, and are concentrating their efforts on Africa and the area between Europe and Asia. These two regions of the world were, populated first by humans.

Cave art was carved or painted on the walls and roofs of caves, usually near the entrance. The entrance area was probably chosen to take advantage of daylight and to allow many people to view the paintings. In some cases, the art appears much deeper in caves and requires artificial light. Evidence suggests that the artists used torches or shallow bowls in which animal fat was burned.

9.What was the response of general public to the discovery of cave art made by Stone Age people?

A. They believed it at first.

B. They did not believe it.

C. They thought it was beautiful.

D. They ignored it.

10.According to the passage, what can we conclude about animal fat?

A. It does not burn.

B. Stone Age artists used it to preserve their paintings.

C. It can be burned to produce light.

D. Stone Age artists mixed it with their food.

11.. Where do scientists expect to find more cave paintings?

A. In Central and South America.

B. In Spain and France.

C. In the places where there are caves with large openings.

D. In the regions of the world first populated by humans.

12.Where would this passage be most likely to appear?

A. In a textbook about early human history.

B. In a textbook about modern art.

C. In a dictionary.

D. In an encyclopedia entry about caves.

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借助《工业与民用配电设计手册》第三版第891页表14-12及有关曲线,估算矩形基础板的接地电阻。已知条件如下:①基础板长边的边长L1=100m,短边的边长L2=10m;②基础深度t=3m;③土壤电阻率ρ=100Ω·m。

该基础板的接地电阻约为()。

A.0.5Ω

B.1Ω

C.2Ω

D.4Ω

题型:单项选择题

如果法院支持了撤销权人的诉讼请求,如果撤销的是无偿转让或者是不合理的低价转让,就等于赠与合同、买卖合同归于无效。

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