本文研究石油机械企业多产品生产的规划决策问题，运用系统动力学的原理建立了相应的系统模型。
This paper researches the planning and decision making problem of petroleum mechanical multiproduct enterprises, and establishes the corresponding system model by using systematic dynamic principle.
运用变质量系统的基本原理，建立轴流脱粒过程中谷物运动的非线性动力学模型。
Based on the principle of a varied mass system, the non linear mathematical model of the crop mechanics for an axial threshing process was set up.
本文从绿地系统着手，运用景观生态学的原理和方法，对乌鲁木齐市绿地系统作了综合评价。
This paper starts with Greenland system and USES fundamental methods of landscape ecology to analyze the landscape heterogeneity of vegetation in Urumqi.
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