开车进料前必须请仪表工将可燃气体报警器全部投用。

题型:判断题

问题:

开车进料前必须请仪表工将可燃气体报警器全部投用。

考点:气体分馏装置操作工气体分馏装置操作工题库
题型:判断题

24h内持续在39℃~40℃,伴随寒战、胸痛、吐铁锈痰;需考虑患()
儿童发热,伴咳嗽、流涕、眼结膜充血及全身斑丘疹;需考虑患()
儿童或青少年发热,伴耳垂为中心的腮腺肿大;需考虑患()

A.麻疹

B.肺炎

C.肺结核

D.流行性感冒

E.流行性腮腺炎

题型:判断题

阅读理解。

     How could we possibly think that keeping animals in cages in unnatural environments-mostly for

entertainment purposes-is fair and respectful? Zoo officials say they are concerned about animals. However,

most zoos remain "collection" of interesting "things" rather than protective habitats (栖息地).

     Zoos teach people that it is acceptable to keep animals bored, lonely, and far from their natural homes.

     Zoos claim to educate people and save endangered species, but visitors leave zoos without having leamed

anything meaningful about the animals' natural behavior, intelligence, or beauty. Zoos keep animals in small

spaces or cages, and most signs only mention the species' name, diet, and natural range.

     The animals' normal behavior is seldom noticed because zoos don't usually take care of the animals' natural

needs. The animals are kept together in small spaces, with no privacy and little opportunity for mental and

physical exercise. This results in unusual and self-destructive behavior called zoochosis. A world-wide study

of zoos found that zoochosis is common among animals kept in small spaces or cages. Another study showed

that elephants spend 22 percent of their time making repeated head movements or biting cage bars, and bears

spend 30 percent of their time walking back and forth, a sign of unhappiness and pain.

     Furthermore, most animals in zoos are not endangered. Captive breeding (圈养繁殖) of endangered big

cats, Asian elephants, and other species has not resulted in their being sent back to the wild. Zoos talk a lot

about their captive breeding programs because they do not want people to worry about a species (物种) dying

out. In fact, baby animals also attract a lot of paying customers. Haven't we seen enough competitions to name

baby animals?

     Actually, we will save endangered species only if we save their habitats and put an end to the reasons people

kill them. Instead of supporting zoos, we should support groups that work to protect animals' natural habitats.

1. How would the author describe the animals' life in zoos?[ ]

A. Dangerous.

B. Unhappy.

C. Natural.

D. Simple.

2. In the state of zoochosis, animals ____ according to the passage. [ ]

A. remain in cages

B. behave strangely

C. often attack other animals

D. enjoy walking around

3. What does the author try to argue in the passage? [ ]

A. Zoos are not worth the public support.

B. Zoos fail in their attempt to save animals.

C. Zoos should treat animals as human beings.

D. Zoos use animals as a means of entertainment.

4. The author tries to persuade readers to accept his argument mainly by ____. [ ]

A. pointing out the faults in what zoos do

B. giving examples of animals in the wild

C. questioning the way animals live

D. discussing the advantages of natural habitats

5. Although he is against zoos, the author would still admit that ____. [ ]

A. zoos have to keep animals in small cages

B. most animals in zoos are endangered species

C. some endangered animals are reproduced in zoos

D. it's acceptable to keep animals away from their habitats

题型:判断题

对中、小型形状复杂的装配件,宜采用( )方法清洗。

A.溶剂油
B.热空气
C.金属清洗剂
D.多步清洗法或浸、涮结合

题型:判断题

把审美体验看作是意识对象对人的意识产生的注意力吸引和由此引起沉思的是()。

A.内容倾向型定义

B.影响倾向型定义

C.无利害性定义

D.表现属性型定义

题型:判断题

简述活塞泵的工作原理?

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