Relevant alternative processes were discussed on the basis of atom utilization, Efactor and environmentalcoefficient.
全面分析了原子利用率、E -因子和环境系数，并利用它们作为化工过程新的评价指标。
2
Nitrogen is the inert gases, low expansion coefficient, not easily with the environmental temperature rise for a long time, can maintain normal tire pressure, greatly reduce the flat tire.
氮气是惰性气体，膨胀系数低，不轻易随环境温度上升而上升，可较长时间维持正常胎压，大大降低爆胎几率。
3
The environmental and economic factors affecting the space component and the time coefficient are sieved by stepwise regression, and factor structure models are established.