优质品的平均无故障连续运行时间都大于1000小时，有的高到数千小时。
Quality product, the average trouble-free continuous operation time more than 1000 hours, some as high as thousands of hours.
优质品的平均无故障连续运行时间都大于1000小时，有的高到数千小时。
Quality product, the average trouble-free continuous operation time more than 1000 hours, some as high as thousands of hours.
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