The card must be used at the same time as the pass. This certificate is valid only after it is sealed and signed by the management company. According to relevant information, there are mainly the following types of loading and unloading: 1. According to the objects of logistics facilities and equipment, enterprises have loading and unloading activities in logistics facilities, including loading and unloading activities in warehouses, distribution facilities and places. Loading and unloading in public logistics facilities, including loading and unloading activities in highway transfer stations, ports, railway stations, airports, warehouses and other facilities and places. 2 according to the transportation section, including car loading and unloading, railway freight car loading and unloading, ship loading and unloading, aircraft loading and unloading. 3. The lifting operation is classified according to the operation type: it is realized by the vertical movement of lifting equipment. Fork-up and fork-down operation: realized by the movement of forklift. Ro-Ro type: It is convenient for vehicles to roll on or board, which is called "piggyback transportation" on the railway. Up-and-down moving type: goods are moved from one vehicle or platform to another vehicle or platform through the docking between two vehicles. Bulk unloading: used for loading and unloading bulk goods. 4. Classification according to the movement form of goods.