Chinese term (edited): 備損率

'lu' in the context should be 率。

As 备件（備件）=备损件（備損件） is 'spare part', I guess 備損率 can be translated as 'spare ratio'.

Reference:
http://www.google.cn/search?aq=f&num=100&complete=1&hl=zh-CN...

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Note added at 22 mins (2008-04-17 15:24:57 GMT)
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BTW, pin yin for 率 is 'lv', not 'lu'.

One measure of the effectiveness of spare parts management is referred to as the “turns ratio,” which is found by taking the usage of spare parts inventory over a given time period and dividing by the inventory stock level for that period. A higher turns ratio results from an increase in the amount of parts usage relative to parts kept in stock, and is indicative of more effective parts management than a lower turns ratio. For typical large-scale manufacturing enterprises, the turns ratio for spare parts inventory is around 1 or lower. Enterprises have increased turns ratios for sales inventory management, but have not achieved consummate increases in the turns ratio for management of internal inventories for spare parts and the like.