某锅炉蒸发量1110t/h,过热蒸汽出口焓3400kJ/kg,再热蒸汽流量878.8

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问题:

某锅炉蒸发量1110t/h,过热蒸汽出口焓3400kJ/kg,再热蒸汽流量878.8t/h,再热蒸汽入口焓3030kJ/kg,再热蒸汽出口焓3520kJ/kg,给水焓1240kJ/kg,每小时燃料消耗量为134.8t/h,燃煤收到基低位发热量23170kJ/kg,求锅炉热效率。

考点:热力司炉工考试热力司炉工技师热力司炉工技师题库
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学生在操场上列队做操,只知人数在90~110之间。如果排成3排则不多不少;排成5排则少2人;排成7排则少4人;则学生人数是多少人( )

A.102

B.98

C.104

D.108

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中外合作经营企业采取产品分成方式的,合作者()时,即为取得收入。

A.在产品完成

B.在产品销售

C.在分得产品

D.在取得产品销售收入

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在公安工作中,公安机关要在党委领导下充分发挥自己的( )作用。

A.职能

B.专业

C.关键

D.支柱

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There was a gardener who looked after his garden with great care.To water his flowers,he used two buckets.One was a shiny and new bucket.The other was a very old and dilapidated one,which had seen many years of service,but was now past its best.

Every morning, the gardener would fill up the two buckets.Then he would carry them along the path,one on each side,to the flowerbeds.The new bucket was very proud of itself.It could carry a full bucket of water without a single drop spilled(溢出).The old bucket felt very ashamed because of its holes:before it reached the flowerbeds,much water had leaked along the path.

Sometimes the new bucket would say,“See how capable I am ! How good it is that the gardener has me to water the flowers every day ! I don’t know why he still bothers with you.What a waste of space you are !”

And all that the old bucket could say was,“I know I’m not very useful,but I can only do my best.I'm happy that the gardener still finds a little bit of use in me,at least. ”

One day,the gardener heard that kind of conversation.After watering the flowers as usual,he said,“You both have done your work very well.Now I am going to carry you back.I want you to look carefully along the path.”

Then the two buckets did so.All along the path,they noticed,on the side where the new bucket was carried,there was just bare(光秃秃的)earth;on the other side where the old bucket was carried,there was a joyous row of wild flowers,leading all the way to the garden.

小题1:What does the underlined word “dilapidated” probably mean ?

A.dirty.

B.dark.

C.worn-out.

D.plain-looking.小题2:What was the old bucket ashamed of ?   

A.His past.

B.His aging.

C.His manner.

D.His leaking.小题3:The new bucket made conversations with the old one mainly to _______.

A.laugh at the old one

B.take pity on the old one

C.show off its beautiful looks

D.praise the gardener’s kindness小题4:Why was the old bucket still kept by the gardener?

A.Because it was used to keep a balance.

B.Because it stayed in its best condition.

C.Because it was taken as a treasure.

D.Because it had its own function.

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在其他条件相同的情况下,矩形螺纹的螺旋与三角螺纹的螺旋相比,前者()

A.效率较高,自锁性也较好;

B.效率较低,但自锁性较好;

C.效率较高,但自锁性较差;

D.效率较低,自锁性也较差

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