Evacuation safety risks in subway interval tunnelsInter-district tunnels are relatively closed spaces, connected to the station at both ends of the tunnel, with a general length of 1200m and various pipelines set up on both sides of the tunnel side walls. Due to the constraints of the tunnel section

In our daily life the most common type of glow characters are generally glow through the LED light source, the general production of LED glow type generally resin, plastic, crystal glow characters, the industry will be these different types of material glow characters collectively known as LED glow characters! So what is the difference between blister type, resin glow characters, glow crystal characters?