Now users against liquidity constraints , i can chuanhuan users backlog materials company address users needs 针对现在用户流动资金紧张，我公司可串换用户积压材料，解决用户进行急需。
2.
Four parts are included in this text . 1 . the purpose , the meaning , the content and the method of this research were put forward in this part 主要研究结果如下: 1 、我国种子产业发展的历程分为四个阶段:第一阶段, 50年代初,主要组织群众评选,采取以粮换种,串换推广。
