The on-board water dispenser provides a DC electric heater, which can be used in the car, not higher than 36 volts. Car-mounted drinking fountains adopt the patented technology of "low-voltage DC heating" to provide humanized and quick service for drivers and friends.
Semi-trailer refers to a trailer whose axle is placed behind the center of gravity of the vehicle (when the vehicle is uniformly loaded) and equipped with a coupling device that can transmit horizontal or vertical force to the tractor. Generally, a full trailer has two axles and a semi-trailer has one axle. Semi-trailer refers to a vehicle driven by a main vehicle with the same load without power.