水轮机基本工作参数通常认为有（）。A、工作水头，流量，出力，_爱下问搜题

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问题单项选择题

水轮机基本工作参数通常认为有（）。

A、工作水头，流量，出力，转速，转轮直径；

B、工作水头，流量，出力，效率，转轮直径；

C、工作水头，流量，出力，效率，转速；

D、工作水头，流量，出力，效率。

答案

参考答案：C

填空题

甲乙两地相距140千米，一辆汽车从甲地到乙地用2.5小时，返回时少用1小时，这辆汽车往返的平均速度是______．

完形填空

When we talk about a wolf, we tend to describe it as a kind fierce creature．But is it really true that the wolf stands for devil and ugliness?
Have you read the book "The Wolf Totem'' 《狼图腾》by a famous writer Jiang Rong, which tells the story of the relationship between wolves and human beings? Have you ever   36   the wolves' world? If you had, you would __37  the wolves．In the book, wolves are heroes on the large grassland．They know more about __ 38  than humans．They can attack lambs without disturbing their mothers．They also know how to __ 39  full use of the shape of land to __ 40  sheep．I believe that if wolves were humans, they would be __ 41  at fighting．
The wolf is a kind of special creature that can deeply understand __ 42 ．Each wolf serves its group with its heart and soul．A __ 43  wolf has little power, but a pack of wolves __ 44  nothing．All the wolves obey the rules．__ 45  they are defeated, they run away together. It is their teamwork __ 46  makes wolves powerful．
The wolves also have great self-preservation and won't __ 47  to anyone．The writer, who wrote the book "The Wolf Totem" , __ 48  stole a one - month - old baby wolf and raised it very carefully．To his __ 49 , he found the little wolf still wanted to go back with __ 50  wolves. The little wolf bit through the iron chain that limited it．The wolf was __51  and never gave up fighting __52  its death．It seemed that the little wolf died as a glorious fighter.
I was shocked by this kind of __53  wolves which are one of the most respected creature on the earth．I want everyone to look at wolves in a __54 way．They are our teachers．They show us how to survive and __55  this not simple but dangerous world．Please honor the wolves, please honor all these heroes of nature!

A．talked about

B．walked into

C．thought about

A．considerate

B．imaginative

A．satisfaction

C．disappointment

A．selflessness

B．self-confidence

C．self-protection

D．sell-respect