The first batch of scale: mass production of 2 30Kn customized content: successful development of 2 n communication methods: email + skypen sample selection method: sample delivery method: logistics method: customs clearance + sea transportation n substation engineering, as well as the installation and debugging of complete sets of high and low voltage equipment for industrial and civilian high and low voltage equipment, power equipment maintenance engineering, power usage plan, drawing design, power supply planning, power supply process processing, etc.