The accurate prediction of running status and maintenance interval for mechanical equipment is important for avoiding serious accident and saving maintenance cost.

对机械设备的运行状态、维修周期的正确预测有助于避免恶性事故的发生，并能节约维修费用。

Two maintenance interval models with maximum availability and average cost are proposed, and the importance of the two is determined by the way of expert evaluation.

提出了可用度最大和平均维修费用最低的两种维修间隔期模型，采用专家评分的方式确定二者的重要度，通过计算得出最佳维修间隔期。

The maintenance by closed loop feedback of a preselected irradiance throughout a designated exposure interval.

预选辐照整个闭环反馈的维护贯穿于一个指定曝光间隔时间。

Regular maintenance of the system should be carried out by trained personnel or the system supplier preferably at quarterly interval.

应由曾受训练的人员或系统供应商定期检查保养系统，宜每季一次。

The specific maintenance and overhaul interval will vary with the production cycle and the RAW materials to be processed.

具体的维护、维修时间间隔应视所加工的原料及生产周期等相关问题而定。