在发动机初步设计阶段，要根据对发动机的构型方案进行分析与评价，来选择发动机主要设计参数，并从多个发动机方案中选择最佳方案。
In the preliminary design phase of engine, engine configurations must be analyzed and assessed to choose main design parameters and to select optimal engine scheme from multiple candidates.
通过仿真分析，可以对施工机械的机型、数量以及作业参数作出最佳选择，并且预测出施工的最短工期和最低施工费用。
By simulating analysis, the optimal parameters, Numbers and type of construction machinery can be obtained, and the smallest cost and shortest period of construction projects can be predicted.
通过试验，得出了该配方的最佳工艺参数，并对影响抛光效果的因素进行了分析。
The optimal technological parameters of the formulation were obtained by test, and the factors influencing polishing effects were analysed.
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