离心泵的主要技术性能参数有哪些?

题型:问答题 简答题

问题:

离心泵的主要技术性能参数有哪些?

考点:输油工考试输油工中级输油工中级题库
题型:问答题 简答题

阅读理解。

     More and more people around the world are joining in dangerous sports. Some people climbed the

highest mountains; some traveled into unknown parts of the world; some sailed small boats across the

largest sea. Now some people begin to look for new excitement.

     Bungee jumping (蹦极) and motorcycle racing  (摩托车赛) are  quite dangerous sports. Bungee

jumping only lasts a few minutes or even seconds. You jump from a high place, 200 meters above the

ground, and there is a  rubber  band (橡胶带子) tied to your legs. When you jump down, the rubber

band pulls you up. About 2,000,000 people around the world have tried bungee jumping.

     Why do people join in these dangerous sports? Some scientists say that it is because modern life

has become safe and it is not interesting. In the past, people lived in danger. They had to go out and

look for food, and life was like a fight but was interesting.

     Many people think that there is little excitement in life. They live and work in safe places, buy food

in shops, and there are doctors and hospitals to look after them if they become ill.

1.People like to join in dangerous sports because _______.

A.they have a lot of free time

B.they can go to the hospital if they are hurt

C.they need excitement

D.they don't need to look for food

2._______ is not a dangerous sport.

A.Climbing the highest mountains

B.Riding on the road

C.Traveling into unknown parts of the world

D.Sailing small boats across the largest sea

3.In bungee jumping, you _______.

A.jump up as high as you can

B.jump down with a rubber band tied to your legs

C.jump down without a rubber band

D.jump to the ground

4.In the past, people lived in danger because _______.

A.the living condition is poor

B.there was no doctor and hospital

C.there were many dangerous animals

D.all of above

5.Which is not TRUE?

A.Everyone's life is interesting.

B.Many people live and work in safe places.

C.Many people buy food in shops.

D.People can go to see the doctors when they become ill.

题型:问答题 简答题

生物圈的范围是[ ]

A.海平面以下10千米和海平面以上10千米之间

B.海平面以下20千米

C.海平面以上20千米

D.全部在岩石圈

题型:问答题 简答题

轮状病毒肠炎的发病机制是

A.不消化食物发酵腐败的毒性产物刺激肠壁,使肠蠕动增加
B.肠毒素导致小肠绒毛上皮吸收NaC1、 H2O受抑制,并促进肠腺分泌C1
C.细菌侵入肠黏膜,引起充血、水肿、溃疡和渗出
D.小肠绒毛上皮细胞变性、坏死,导致回吸收水分和电解质能力受损
E.天气过冷,使肠蠕动增加;天气过热,消化液分泌减少

题型:问答题 简答题

女性,60岁,早晨起床时发现右上下肢麻木,但可以自行上厕所,回到卧室因右下肢无力摔倒。检查:神志清楚,右侧轻偏瘫,偏身感觉减退

患者入院后病情加重,发病36小时检查:嗜睡,右上下肢肌力0级。为明确诊断,最有鉴别价值的辅助检查为()

A.脑血管造影

B.头颅CT

C.腰穿

D.TCD

E.SPECT

题型:问答题 简答题

AutoCAD绘图时,在命令行输入RAY,表示绘制()。

A.直线

B.多义线

C.构造线

D.射线

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