单项选择题

（）creates time value.

A. Transportation
B. Good flow
C. Different location
D. Storage

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单项选择题

A. cost reduce
B. cost increase
C. effective
D. efficient

单项选择题

A. The high value
B. Low density or weight
C. A and B
D. To add cost

单项选择题

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