Disassembling the organizing process of enterprises alliance and enterprises group into four stages and establishing mathematical model of the organizing costs.
将企业联盟和企业集团的组建过程分解为四个阶段，建立了其组建成本的数学模型；
Four images representing the different stages of the studio: installation, tectonic model, analytical model, and final model. image courtesy of MIT OCW.
这四张图片展示了实践课程的不同阶段：安装，构造模型，分析模型，以及最终模型。图片由麻省理工学院开放式课程网页提供。
The mathematical model of six-factor linear regression equation about conductivity on the basis of aluminium electrolysis practice was derived in four stages.
并根据工业铝电解的实际情况，分四段求出了其电解质的电导率数学模型。
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