estimated annual usage quantity 估计年度使用数量
Pavement structure layer inside base course is usage quantity of main supporting course, its usage direct influence the function pavement.
路面结构层中基层是主要承重层，它的使用性能直接影响路面的使用质量。
The locomotive usage set number of how much, the locomotive usage efficiency of high and low all affect the quantity and the quantity index sign that the railroad transports the production directly.
机车使用台数的多少、机车运用效率的高低都直接影响着铁路运输生产的数量与质量指标。
The main obstacle which prevents the common usage of on-line detecting system is the large quantity of line poles and towers.
现有在线检测系统能否普遍应用的主要障碍是线路杆塔的数量巨大。
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