对一维渐变渗流,完全潜水井的含水层厚度H为8m,井的半径r0=0.2m,抽水时井的涌

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问题:

对一维渐变渗流,完全潜水井的含水层厚度H为8m,井的半径r0=0.2m,抽水时井的涌水量Q为0.03m3/s,井中水深h为5m,若取影响半径R=400m,计算渗流系数k为()。

A.0.0025m/s

B.0.0018m/s

C.0.018m/s

D.0.025m/s

考点:注册电气工程师电气工程公共基础注册电气工程师基础考试上午真题2006年(仅供参考)
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一项工程投资20万元,比计划节约投资35万元.节约投资百分之几?

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Mr. Rock teaches maths at a secondary school. He knows well of his neighbours except the man who lives next door. The man never speaks to anyone and no one knows what he does to make a living .

One day, when Mr. Rock came home from work , he found a gold necklace outside his door. Mr. Rock wondered where it came from. He thought that perhaps someone had dropped it. Mr. Rock planned to take it to the police station the next day. He thought the police would be able to find the owner.

Just then, the police came to Mr. Rock’s home and saw the necklace in his hand. Mr. Rock was very shocked when he was accused(起诉) of robbery(抢劫). A policeman told him that a jewellery shop had been robbed. A witness said that she had seen someone run from the jewellery shop into Mr. Rock’s building right after the robbery.

Mr. Rock was not the robber, but how could he prove it?

小题1:What’s Mr. Rock’s job? (不超过5个单词)____________________________________

小题2:Where did he find the necklace? (不超过3个单词) _______________________

小题3:Why did Mr. Rock feel shocked? (不超过6个单词) ________________________

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风沙区的防护林体系主要包括()、()、()、()。

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根据联合国设计推荐使用的用英文字母表示的货币代码,如下表示不正确的是()。

A、CNY89.00

B、GBP89.00

C、RMB89.00

D、USD89.00

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喷灯的基本构造:燃油灌、()、把手、油杯、油针、及旋钮、防火罩、喷咀。

A.气筒

B.油封

C.汽油

D.油漏

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