欧美性白人极品1819hd,岛国av无码不卡电影下载,凌辱人妻温泉,亚洲AVA级毛片久久久,久久精品亚洲一级毛片

Used in large, medium and small power plants and substations to provide dc power supply for switching, relay protection, automatic control, accident lighting, etc. The reliability of dc screen is irreplaceable by other power supply devices. It can meet the high reliability requirements of power supply in substation and power plant.
This product conforms to: GB hall 19826-2005 general technical conditions and safety requirements for dc power supply equipment in power engineering; General technical conditions and safety requirements for dc power supply equipment in power system JB/ t8456-1996 low-voltage dc switchgear set; DL/ t459-2000 technical conditions for ordering dc power supply cabinet of power system; DL/T 5041-95 technical specification for design of communication in thermal power plant.