[单选题]What is the disadvantage for air transportation?()
正确答案 :D
The highest cost in all transport modes
[单选题]()is software about the relation between the customer and the supplier in marketing.
正确答案 :A
解析:中文:客户管理系统是一种软件,它是关于供应商与客户在市场之间关系的一种软件。
[单选题]Pipelines are not ()
正确答案 :A
labor-intensive
解析:中文:管道运输是非劳动密集型的。
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