By means of the double combination designs, a mathematical model for the natural yield capacity of millet in Heilongjiang Province was established.
在此基础上，运用双重组合设计原理，初步建立起该省谷子自然生产力的数学模型。
By means of the double combination designs, a mathematical model for the natural yield capacity of millet in Heilongjiang Province was established.
在此基础上，运用双重组合设计原理，初步建立起该省谷子自然生产力的数学模型。
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