对组件软件可靠性进行优化工作时，不仅需要最大化其可靠性估计值，同时还要最小化可靠性估计方差以及测试代价。

Optimizing the software components reliability, not only need to maximize the reliability of the estimates, but also need to minimize reliability estimation variance and testing costs.

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经现场调试及生产运行表明，软水处理PH值控制系统工作稳定可靠，控制器算法能满足各项控制要求。

After adjustment and operation, it can be seen that the PH value control system of soft water treatment is stable and reliable and the algorithm of controller can meet all the requirements of control.

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指出螺栓联接的扭紧力矩值不仅与螺栓的公称直径及性能等级有关，还与能否保证联接可靠工作有关。

The value of tightening torque is relative not only to the nominal diameter and quality class of the bolt, but also to the security of the threaded fastener.

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