大圆的半径是4厘米,小圆的半径是3厘米,大圆和小圆的面积之比是( ) A.16:9 发布时间:2017-07-02 05:33 │ 来源:www.tikuol.com 题型:选择题 问题: 大圆的半径是4厘米,小圆的半径是3厘米,大圆和小圆的面积之比是( )A.16:9B.4:3C.3:4
题型:选择题 Which of the following is true about American transportation system a. Only those who are well off can afford to travel by plane. b. Trains run even slower than cars. c. People prefer to take trains even they are slower than planes. d. Cars are preferred over planes. 查看答案
题型:选择题 下列关于安全库存描述正确的是()。A.指在给定时期内为了满足顾客需求变动而保有的超过预测数量的库存 B.其产生的原因有二:一是需求量预测不确定;二是如果产品的实际需求量超过预测值就会导致产品短缺 C.管理者在制定安全库存决策时必须进行收益和成本分析 D.对企业来说安全库存越小越好 E.安全库存越大越好 查看答案