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The abrasion-resistant and rustproof sleeve is the only part exposed to the chain and the process, which results in a long service life minimal maintenance requirements.
这种耐研磨和不生锈套管是阀门中唯一与锚链接触的部件，因此阀门的使用寿命就更长，对维护的需求也更少。
Vertical turbine pumps (equivalent to Process Systems Thrust Head) have proven cost effective due to the ease of maintenance and long service life.
垂直涡轮泵(相当于系统过程推动头)由于易于维修和较长的使用期限已被证明是节省成本的。
The optimal control policy of machine service rate and preventive maintenance rate is derived from Markovian optimal decision process formulation.
我们运用马尔可夫最优决策过程归纳方法，导出机器服务率和预防维护率的最优控制策略。
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