正确答案: B
80%
题目:Railroads own about ()of their car fleet.
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学习资料的答案和解析:
[单选题]What is the disadvantage for air transportation? ()
The highest cost in all transport modes
[单选题]Without (), supply chain management doesn’t work.
internet
解析:中文:没有了互联网,供应链管理就没有办法进行。