Job stress on the impact of miners is the main cause of coal mine safety management accidents, so miners' job stress is a burning problem needed to be settled.

工作应激对煤矿工人的影响是导致煤矿安全管理事故发生的主要原因，所以，煤矿工人的工作应激是一个亟待解决的问题。

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When daily use will cause some wear and tear epoxy floor, so we must use some of the main issues, do not stress, do not use corrosive stuff, all kinds of forklifts, hydraulic car use frequency.

环氧地坪的日常的使用时会造成一些磨损和破坏，所以我们一定主要一些使用事项，不要重压，不要使用带腐蚀性的东西，各种叉车、液压车的使用频率等。

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Crack in neck of hollow shaft is a very serious malfunction, main cause of the crack include: foundry defect, centralized stress, quality problems of welding and heat treatment.

中空轴轴颈裂纹是水泥磨的严重故障。中空轴轴颈裂纹产生的原因主要有：铸造缺陷，应力集中，焊接和热处理质量问题等。

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