Building exterior wall insulation board fixed bolt specification how much distance one
safety technology information is the product of safe production process and crystallization, due to the scientific management of data management, standardization, standardization, can continue to promote the construction site safety management to a higher level and level of development, so that construction Site management as a whole more scientific, standardized and standardized
Construction site tower crane (tower crane) lightning protection grounding resistance should not be greater than 4Ω