与普通销售网站Ｂ－Ｃ（商家对 顾客）的销售模式不同，零部 件的销售采用的是Ｂ－Ｂ（商家对商家）的销售模式。零部件的买主通常都是整机制造商。例如，生产自行车的制造商至少需要采购百余种零部件，而生产农用车的制造商则可能需要采购千余种零部件。在当今几乎所有的单位 Unlike the general sales website B-C (merchant-to-consumer) sales model, parts sales use a B-B (merchant-to-merchant) sales model. Parts buyers are usually machine builders. For example, manufacturers of bicycles need to purchase at least a hundred types of parts, while manufacturers of agricultural vehicles may need to procure more than a thousand parts. Almost all of today’s units