Three ways are proposed to analyze different corporations and then recognize the competitive superiority, i. e., the models of competitive status, value chains and life period of products.
通过竞争地位的模型分析、价值链分析和产品生命周期分析三条途径来识别企业的竞争优势。
The three models are different from each other in procedure, mode and method with different value orientations.
每一种模式都有自己一套独特的惯常的程序、方式、方法，都有各自的价值取向，三种模式是相互区别的。
Three kinds of models of carrier phase observation value linear combination are deduced such as wide lane, narrow lane and free ionosphere.
推导了三种载波相位观测量线性组合的模型：宽巷组合、窄巷组合和无电离层延迟的组合。
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