That "negative" character means that the stabilizing power of contract does not impede productive flexibility.
“消极”的特征意味着契约的稳定力量不会妨碍到生产的灵活性。
Ancient people used it to shorten productive cycle, keep special character of species and expand reproduce coefficient.
古人主要将嫁接技法应用在缩短生产周期，保持物种特异性状和扩大繁殖系数上；
The paper focused on cultural character , pathogenic differentiation and vegetative compatibility of 35 strains from the main cotton productive regions in Xinjiang and 5 standard strains .
对新疆棉区采集的35个棉花黄萎病菌代表性菌系进行了生物学特性研究、鉴别寄主法测定及营养亲和群研究。
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