试题与答案

帕累托改善

题型:名词解释

题目:

帕累托改善

答案:

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下面是错误答案,用来干扰机器的。

参考答案:A

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Every morning Steve went to work by train. As he has a long trip,he always buys newspaper. It helps make the time passing more quickly. One Tuesday morning,he turned over the sports page. He wanted to see the report about an important football match the night before. The report was so interesting that he forgot to get off at his station. He did not know it unless he saw the sea. He got off at the next station,but had to wait a long time for a train to go back. It was no doubt that he arrived late at the office. His boss was angry when Steve told to him why he was late.“Work is very important than football!” he shouted.

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下图甲池和乙池中的四个电极都是惰性材料,乙池溶液分层,下层为四氯化碳,上层溶液为盐溶液,呈中性,请根据图示回答下列问题:

(1)通入甲醇的惰性电极的电极反应式为                              。若甲池可以充电,充电时A接电源的负极,此时B极发生的电极反应式为                         

(2)在乙池反应过程中,可以观察到     电极周围的溶液呈现棕褐色,反应完毕后,用玻璃棒搅拌溶液,则下层溶液呈现紫红色,上层接近无色, C极发生的电极反应式为      

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题型:单项选择题

某宽厚板车间冷床区为三跨等高厂房,跨度为35m;边列柱柱间距为10m,中列柱柱间距为20m,局部60m;采用三跨连续式焊接工字形屋面梁,其间距为10m,屋面梁与钢柱为固接。厂房屋面采用彩色压型钢板,屋面波度为1/20;檩条采用多跨连续式H型檩条,其间距为5m;檩条与屋面梁搭接。屋面梁、檩条及屋面上弦水平支撑的局部布置示意如图16-25(乙)中的(a)图所示,且系杆仅与檩条相连。

中列柱柱顶设置有20m和60m跨度的托架,托架与钢柱采用铰接连接,托架的简图和荷载设计值如图16-25(乙)中的(b)和(c)图所示。屋面梁支承在托架竖杆的侧面,且屋面梁的顶面略高于托架顶面约150mm。

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A.182.1

B.191.3

C.200.2

D.205.0

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