You might just as well tell the manufacture that male customers _____ not like the design of the furniture. ( A. must B. shall C. may D. need 答案:C12.在一密闭容器中加入甲、乙、丙、丁四种物质,在一定条件下发生化学反应,测得反应前后各物质质量如表:物质甲乙丙 丁 反应前质量/g1642 24 反应后质量/g8322 x反应中乙、丁的质量变化之比为7:5;该化学反应的基本类型化合反应.