问题
单项选择题
某工厂生产两种产品S和K,受到原材料供应和设备加工工时的限制。单件产品的利润、原材料消耗及加工工时如下表所示。为获得最大利润,S应生产()件。
A.7
B.8
C.9
D.10
答案
参考答案:B
解析:
该问题用线性规划模型求解。设利润为z,为了获得最大利润,S应生产x1件,K应生产x2件。对该问题求解最优方案可以由下列数学模型描述:
求解得x1=8,x2=2;故S应生产8件。
某工厂生产两种产品S和K,受到原材料供应和设备加工工时的限制。单件产品的利润、原材料消耗及加工工时如下表所示。为获得最大利润,S应生产()件。
A.7
B.8
C.9
D.10
参考答案:B
解析:
该问题用线性规划模型求解。设利润为z,为了获得最大利润,S应生产x1件,K应生产x2件。对该问题求解最优方案可以由下列数学模型描述:
求解得x1=8,x2=2;故S应生产8件。
Many teenagers have hobbies.But sometimes these hobbies can get way of schoolwork. and Parents might worry about their at school.Teenagers often think they should be allowed to practice their hobbies as much as they want.Do you agree? Liu Yu, a boy from Shandong.is a running star.He is on his school running team and has always wanted to be a professional athlete.However,his parents won’t allow him to tram as much as he would like. “Of course we want to see Liu Yu his dream.”says Mr. Liu.“and we know he loves running. That's great.and my wife and I have watched him in every one of his races.We have nothing running. But we do think that our son needs to be realistic.Now that he is getting older. he needs to think about what will happen he doesn’t become a professional runner in the end. Liu Yu really .“Well.I think I should be allowed to make decisions for myself.”he says.“My parents have always taught me the of working hard and not just to do what I enjoy. I understand this. But I'm serious about running. a professional runner is the only thing I have ever wanted to do. Mr. and Mrs. Liu believe that Liu Yu should study hard in the evenings. and so they don’t allow him to practice on school nights.“I know this seem strict,”says Mrs. Liu“but we think we’re doing the right thing.He has to understand very people can become professional athletes. It's a very difficult dream to achieve. so we think he needs to spend more time his homework. But Liu Yu still doesn’t agree.I know my parents care about me,but they are always talking about what if I don't succeed in the future.But I will succeed! I think I should be allowed to make this decision for myself.Only then will I have a chance of achieving my dream.
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