According to the space of product design, some connected factors with design problems are sought, the objective trees are established, and the function constructions are founded.
分析了产品的设计空间及设计问题关联因素，确立目标树，建立功能结构。
Objective】The objective of this study was to find biomass and nitrogen distribution in different parts of dormancy apple trees.
【目的】探讨休眠期苹果树体不同器官生物量与氮素分布的规律。
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