根据农机覆盖件模具的结构特点，提出了CAD系统的总体设计方案。
The overall design plan of the CAD system is put forward based on structure features of farm machine panel die.
由模型分析可见，农机新度系数、大中型拖拉机的新旧结构比例是影响大中型拖拉机完好率的两大重要因素。
The analysis on models showed that newness coefficient of agricultural machinery, proportion of new and old tractors are two important factors affecting on the intact rate of large medium tractors.
农机化装备结构优化评价的问题具有灰色性和模糊性的特点，对其进行评价分析，传统的方法具有很大的局限性。
The question of evaluation of agriculture machine structure optimum has the feature of grey and fuzzy, the traditional methods are greatly limited to solve this problem.
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