Lifeistopic

The heating circuit of water dispenser is composed of heating switch, power fuse tube, heating temperature controller, electric heating tube, heating indicator light, etc. its working principle is as follows:When the water dispenser is plugged in and the power switch is pressed, 220V alternating current is added to the...

Can t you drink water from three kinds of drinking fountains? The fountainhead is the fountainhead of drinking water!Public places such as schools and companies often have drinking fountains. The buckets of drinking fountains are sealed, but how many people have paid attention to the sanitation problems of drinking fou...