Railroads own about （）of their car fleet.

【名词&注释】

供应链(supply chain)、互联网(internet)

[单选题]Railroads own about （）of their car fleet.

A. Half
B. 80%
C. 20%
D. Not mentioned

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学习资料：

[单选题]What is the disadvantage for air transportation? （）

A. Quick but not safe
B. Less frequency
C. It can’t lift heavy goods
D. The highest cost in all transport modes

[单选题]Without （）, supply chain management doesn’t work.

A. logistics information system
B. cable
C. internet
D. computer

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