实践的直接现实性品格往往产生现实的或潜在的盲目性，由此决定了理论对实践的指导和批判作用。
Substantial character of practice often produces blindness of reality or latency, so decide theory having the function to direct and criticize practice.
因此，分销商指标评价体系问题研究不仅具有理论意义，而且对实践还具有一定的指导价值。
So the study on the evaluation system of the distributors has both the academic meaning and the indicative value to the practice.
通过模型试验，运用数理统计的方差分析理论对切缝套管的参数进行技术优化，以指导工程实践。
By model experiment, the parameters of slit holder are optimized turning to variance analysis theory of mathematical statistics in order to guide engineering project.
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