老人跌倒,扶不扶原本不需讨论的问题,时下却成为社会热议的话题。据某网站调查,44%的网友选择“不会搀扶”,38%的网友选择“不好说”,18%的网友表示“肯定会扶”。一位网友说:“以前觉得自己一定会扶,因为过不了良心关;现在肯定不会扶,因为过不了责任关。”材料表明()。
①价值判断与价值选择具有社会历史性
②价值判断与价值选择具有阶级性
③价值判断与价值选择具有主体差异性
④人们的价值选择是在价值判断的基础上作出的
要求结合所学知识分析材料回答问题。
阅读材料回答问题。利用贪心法求解0/1背包问题时,()能够确保获得最优解。用动态规划方求解O/1背包问题时,将“用前i个物品来装容量是x的背包”的0/1背包问题记为KNAP(1,i,X)设fi(X)是KNAP(1,i,X)最优解的效益值,第j个物品的重量和放入背包后取得效益值分别为W和p(j=1~n),则依次求解f0(X),f1(X),…,fn(X)的过程中使用的递推关系式为()
利用贪心法求解0/1背包问题时,()能够确保获得最优解。阅读以下说明,回答问题1~4。
The“standard of living”of any country means the average person’s share of the goods and services the country produces.A country’s standard of living,therefore, (51) first on its capacity to produce wealth.“Wealth”in this (52) is not money,for we do not live on money but on things that money can buy:“goods”such as food and clothing,and“services”such as transport and entertainment.
A country’s capacity to (53) wealth depends upon many factors,most of (54) have an effect on one another.Wealth depends (55) a great extent upon a country’s natural resources.Some regions of the world are well supplied with coal and minerals,and have fertile(肥沃的)soil and a favorable climate;other regions (56) none of them. Next to natural resources comes the ability to (57) them to use.C
A. calls
B. gets
C. depends
D. takes
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