And has compact structure, the expansion of portfolio of simple, long life, less maintenanceexpenditure and so on.
并具有结构紧凑，扩展组合简捷，使用寿命长，维护开支少等特性。
2
To evaluate feasibility of a waterway project, the most important index is EIRR, which is calculated based on the economic benefit, investment and maintenanceexpenditure.
评价航道工程在经济上是否可行，最重要的一个评价指标就是经济内部收益率。
3
Applying reliable theories, the decision-making model of optimum maintenance period for fully mechanized face equipment has been developed based on the rule of minimum running expenditure.