单项选择题 In general, factors influencing transportation costs can be grouped into 2 major categories---product-related factors and market-related factors. Please find below, （）is not belong to the market-related factors.

单项选择题 As some countries attempt to shift away from natural gas or petroleum energy systems toward coal-based systems, the need for coal slurry(煤泥) will increase in these countries,（）transport mode will be the first choice for transfer this kind of product.

单项选择题 The supply chain activities encompass all associated with the flow and transaction of goods, the flow of information from the raw materials supplier to the end user, as well as the reverse flow of materials and in formation in the（）