單項選擇題The disadvantages of rail compared with motor carrier are()

A. Cost  
B. Speed   
C. Lost and damage ratios   
D. Transit time and frequency of service


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5.單項選擇題It is important to note that from the core company’s perspective, the supply chain includes (), upstream supplier and down stream customers.

A.Internal functions
B.External functions
C.Information systems
D.Physical distribution

7.單項選擇題()are respectively the dominant transport mode in China and in the United States.

A.Rail and motor
B.Motor and rail
C.Rail and rail
D.Water and rail