大家知道,一种事物的质量好坏,常常需要一定的数量来表示。要全面评定一个矿井通风系统技术经济上的合理性,就必须通过测定得出一些具体的指标来说明。我们从实践中体会到,这种指标可以提出很多,但是指标太多不仅测定计算工作烦琐,而且不便于简单明了地说明通风系统的合理性。因此在提出指标之前,应先明确制订指标的原则,以便依据这些原则提出或选择指标。这些原则不外乎是: We all know that the quality of a good thing, often require a certain amount to represent. To fully assess the economic and technical rationality of a mine ventilation system, we must draw some specific indicators to determine. We have learned from practice that many kinds of indicators can be proposed, but too many indicators are not only cumbersome to measure and computational work, but also inconvenient to explain the rationality of ventilation systems simply and clearly. Therefore, before the index is put forward, the principle of setting the index should be clearly defined in order to put forward or select the index according to these principles. These principles are nothing more than: