It is difficult for a single transport mode to efficiently
complete the transportation task perfectly. Road, rail,
water, air and other modes of transport have their own
time and space characteristics. Therefore, enterprises
should combine with the characteristics of a variety of
transport modes, select the best combined transport
program according to the principle of reducing pollution,
improving the efficiency and effectiveness, and build a
logistics and transport networks of energy-saving,
environmental protection, efficient [19].