2 on electrical equipment used in the above work, in addition to maintenance should be zero, and necessary in the first set at the end of the equipment load leakage protection equipment.
对在高处工作中所使用的电器设备，除应作维护接零外，还有必要在设备负荷的首端处设置漏电维护设备。
2
Gas pipeline risk grounded on GIS database instruct daily management of pipeline network by objective analysis and decision, reducing pipeline accident and work load of routine maintenance.
This article gives some discussion on the prevention and maintenance of the straight rails with alternative uneven side wearing in the heavy-load and fast-speed section.