阀门关闭件脱落产生泄漏的原因有哪些?

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问题:

阀门关闭件脱落产生泄漏的原因有哪些?

考点:电厂全能值班员考试发电厂汽机专业知识发电厂汽机专业知识题库
题型:问答题

阅读理解。

     When I was a boy, I liked swimming very much. One year my two brothers and I spent the summer

holidays with my uncle and aunt in their house by the sea. It was only twenty meters from the water.

Every day we put on our swimming shorts before breakfast, ran down to the sea and jumped in. From

then until late in the afternoon we were in the sea of the time. When our aunt rang the bell, we went back

to the house for food, but we ate it in our swimming shorts and were soon back in the sea again. The

water was warm, the sun shone every day and on most days there were no waves. In the middle of the

day a wind always began to blow, but it was not strong.    

     Three times during our holidays we had strong winds. They made big waves in the sea. But we were

all good swimmers and didn't stop swimming until we were tired and happy.

1. The boy _____. [ ]

A. had two brothers

B. lived by the sea with his parents

C. learned to swim a few months ago

D. went to his uncle's house every day

2. One year the boy _____.[ ]

A. went out to look for food by himself

B. learned to swim from his uncle and aunt

C. ran down to the sea every morning

D. went to spend the summer holidays in his uncle's house

3. The boy's uncle and aunt _____. [ ]

A. liked swimming very much

B. the wind always started to blow

C. often took the children down by the sea

D. rang the bell when it was time for breakfast

4. In the middle of the day _____. [ ]

A. there were no waves in the sea

B. the wind always started to blow

C. the sun came out from the cloud

D. the wind began to grow strong

5. The boy and his brothers _____. [ ]

A. swam three times a day

B. did not take a rest until their aunt rang the bell

C. had strong winds three times during their stay at their uncle's

D. did not go swimming when the wing was strong

题型:问答题

《素问·五藏生成篇》说“多食咸”可致

A.脉凝泣而变色

B.皮槁而毛拔

C.筋急而爪枯

D.肉胝皱而唇揭

E.骨痛而发落

题型:问答题

建设用地使用权出让合同约定的使用年限届满后,土地使用者未申请续期或申请未获批准,国家应无偿收回土地使用权。()

题型:问答题

后张法施工中,灌浆用水泥浆抗压强度不应小于()N/㎡。

A.10

B.1.2

C.20

D.30

题型:问答题

腹部检查Courvoisier征阳性,最常见的疾病是()

A.胆囊炎

B.胆囊癌

C.胰腺炎

D.胰头癌

E.胆囊结石

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