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From the testcross performance data, selections, based on an index, were made for intermating of each of the four groups. 根據(jù)測(cè)交種數(shù)據(jù)，利用指數(shù)方法進(jìn)行選擇，方法是對(duì)每個(gè)襍種優(yōu)勢(shì)群進(jìn)行相互交配。