对于某些几何题,按常规方法解答,往往会陷入迷途。解题时,如果能抓住问题的实质,从整体出发、全面思考,往往就能达到直观分析、迅速解题的目的。
This study addresses bilevel linear multi-objective problem issues i.e the special case of bilevel linear programming problems where each decision maker has sev
[题目]一头大象比一头野牛重4.2吨,这头大象的体重是这头野牛的3倍。这头大象和这头野牛的体重分别是多少吨?我是这样解的。解:设这头野牛的体重是x吨,则这头大象的体重是3x
腾讯在北京召开QQ2005正式版新闻媒体发布会那一刻,不经意间,可爱的小企鹅已经7岁了。QQ2005正式版都有哪些功能让我们为之振奋呢?让我们一同感受(如图1)。
利用二氧化钛溶胶进行光催化氯代甲烷的水溶液.二氯甲烷、三氯甲烷、四氯甲烷溶液在二氧化钛溶胶和紫外光的作用下,分解产生氯化氢的水溶液,氯离子和氢离子使溶液的电导率增大.在
作为日常办公中不可或缺的设备之一,多年以来激光打印机都一直占据着办公室的一角。20世纪80年代初期富士施乐,佳能,惠普和IBM等公司共同推动的这场办公革命,在今天进出写字楼的
In this paper, a multi-item inventory model with storage space, number of orders and production cost as constraints are developed in both crisp and fuzzy enviro
In this paper, we utilize Data Envelopment Analysis (DEA), which is a linear programming-based technique, for evaluating the performance of the teams which oper
In a linear world, averages make perfect sense. Something too big is compensated by something too small. We show, however that the underlying differential equat
以氢氧化钙和氯氧锆为原料,氢氧化钾为矿化剂,在150-250℃和6-12h的水热条件下,制备出粉体前驱物,对该前驱物进行900-1000℃焙烧处理,得到CaZrO3微粉.讨论了水热合成条件如:原料种类