制动液的更换周期为40000公里，需要定期更换。
The replacement period of the brake fluid is 40000 km, which needs to be replaced regularly.
研究了预防更换周期和备件贮备量的综合优化决策问题。
An integrated optimization of replacement period and spares have been studied.
该方法对确定机械产品最佳维修更换周期具有重要的指导意义。
This method has important directive significance to confirm engineering product's best maintenance and change cycle.
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