Abstract: Disclosed in embodiments of the utility model is a tractor power supply system, used for supplying power to a power system of a tractor. The tractor power supply system is provided above or below a transport trailer connected to the tractor. The tractor power supply system is provided above or below the transport trailer, and the tractor power supply system can be configured with battery modules of different capacities according to use conditions of the tractor by utilizing the characteristic of a large installation space of the transport trailer, thereby ensuring the endurance mileage and the working time of the tractor.

Abstract: A method for implementing online help by instant messaging, including: instant messaging client software built in software of the user computer logging on an instant messaging server; sending a help request by instant messages from a user computer, and providing by a help information provider and an instant messaging server an instant help to the user computer according to the help request. A system for implementing online help by instant messaging, including: an instant messaging server, a user computer and a help information provider; the help information provider is connected to the instant messaging server, and the user computer logs on and connects to the instant messaging server using the instant messaging client software built in the software of the user computer; the instant messaging server and the help information provider provides the help service to the user computer by instant messaging.