The noise hazard is the bigger harmfulfactor of occupation job grading in Thermal power plant.
噪声是电力行业比较突出、影响较大的职业性有害因素。
2
Non-coal underground mine is big and complex system, carry out safe appraisement must first the existent major dangerous, harmfulfactor in system argue one by one to know.
非煤地下矿山是个大而复杂的系统，进行安全评价必须首先对系统中存在的主要危险、有害因素逐个进行辩识。
3
Productive dust is an occupational harmfulfactor of coal-fired thermal power plant. In the whole course from raw coal approaching to boiler burning and discharging the dust has been produced.