在正常使用过程中化工结构的预防性维修，主要目的是保证结构在预定时间内能完成其设计使用功能。
The preventive maintenance during the normal service period of the corroded chemical structural is to ensure the structure fulfill its designed service function in the given service time.
预防性维修属于一种主动维修，其主要目的是延长设备寿命、延长设备无故障时间、降低设备全寿命费用。
As a kind of initiative maintenance, preventive maintenance mainly aims at prolonging service life of medical equipment, extending their fault-free time and lowering the whole life expense.
当后续使用时间已知时，预防性维修的关键是维修可靠度水平的确定。
On the condition that the continuous service time is given, the main point of the preventive maintenance is the decision of maintenance reliability level.
当后续使用时间已知时，预防性维修的关键是维修可靠度水平的确定。
On the condition that the continuous service time is given, the main point of the preventive maintenance is the decision of maintenance reliability level.
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