线性规划一般模型中,自由变量可以代换为两个非负变量的()A.和 B.差 C.积 D.

题型:单项选择题

问题:

线性规划一般模型中,自由变量可以代换为两个非负变量的()

A.和

B.差

C.积

D.商

考点:数学运筹学运筹学题库
题型:单项选择题

Everyone should work hard more and succeed but it is not wise to get success at the cost of family and health.

There was once a hard-working father. He tried his best to support his wife and three children. He spent all his evenings attending classes, hoping to improve himself so that he could one day find a better-paid job. He hardly ate a meal together with his family. He worked and studied very hard because he wanted to     his family     the best things that money could buy.

Whenever the family complained, he said that he was doing all this for them. But he often wished to spend more time with his family.

The day came when the father was offered a good job. It paid quite well.

However, the family still did not get to see the father for most of the week. He went on working hard, hoping to get the position(职位) of manager.

The father’s hard work paid off and he was promoted(提升). Excitedly, he decided to hire a maid(女仆) so his wife did not have to do the housework any more. He also felt that their three-room house was no longer big enough. It would be nice for his family to be able to enjoy the comfort of a large house. The father decided to further his studies.

As expected, the father’s hard work paid off again and he bought a beautiful house. He told his family that he had decided not to work so hard. From then on he was going to devote more time to his family.

The next day, the father did not wake up. 

小题1:在①处填写适当的词,使句子完整.___________ ______________

小题2:将②句翻译成中文._________________________________________________________

小题3:回答问题Except what did the father do everything he had aimed to do?

_____________________________________________________________________________

小题4:在文章中找出He was rewarded and got high position. 的同义句

____________________________________________________________________________

小题5:找出本文的中心句。__________________________________________________________

题型:单项选择题

在进行体育锻炼时应注意以下那些问题:()

A.要足够的进食量

B.重视蛋白质的补充

C.营养成分要全面

D.养成良好的饮食卫生习惯

题型:单项选择题

液压泵按工作压力的高低分类可分为低压泵、中压泵、高压泵。

题型:单项选择题

岩层的产状要素

题型:单项选择题

()是电网谐波产生的主要原因。

A.不平衡负荷

B.非线性元件

C.一级负荷

D.冲击性负荷

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