题目

（2011·陕西卷）C In early autumn I applied for applied for admission to college. I wanted to go nowhere but to Cornell University,but my mother fought strongly againsnst it. When she saw me studying a photograph of my father on the sports ground of Cornell,she tore it up. “You can’t say it’s not a great university,just because Papa went there.” “That’s not it at all.And it is a top university.”She was still holding the pieces in her hand. “But we can’t afford to send you to college.” “I wouldn’t dream of asking you for money.Do you want me to get a job to h有密度分别为ρ1和ρ2的水溶液各m千克，只用这两种溶液最多可配成密度为的溶液多少千克(已知ρ1＞ρ2且不计混合后体积变化)？