The species' density of the gypsy moth will be controlled under economic permitted level.
终将舞毒蛾的种群密度控制在经济允许水平之下。
This article analysis the quantitative relations between the single quality of a colony of rice plant and the density, output and economic coefficient.
本文分析了水稻群体的个体质量分别与密度、产量和经济系数之间的数量关系;
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