单项选择题运输计划的中心内容是( )。A.承接的市场货运量 B.货物运量与运输工具的安排C.运输工具服务能力 D.市场需求与运输成本
单项选择题Logistics ( ) is the long term cooperation and business relationship between suppliers and customers.A.group B.partner C.linkage D.alliance