The motor on the spot is in operation in the random failure period and therefore its failure rate is approximately a constant.
现场使用的电机基本运行在偶然失效阶段，因而其失效率近似为一常数。
The motor on the spot is in operation in the random failure period and therefore its failure rate is approximately a constant.
现场使用的电机基本运行在偶然失效阶段，因而其失效率近似为一常数。
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