本地纯净下载
纯净官方版凯发K8旗舰厅App下载看种子――牢牢攥紧当家品种,加快选育特色品种,多年来我国农作物品种先后经历了6到8次更新换代。如今,农作物良种覆盖率超过96%,对粮食增产贡献率达45%以上。。
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