单项选择题

what kind of products do the air carriers deliver? （）

A. The high value
B. Low density or weight
C. A and B
D. Shortest time to transport

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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

单项选择题

A. Yes
B. Depend
C. Not
D. I don’t know

单项选择题

A. Great amount of shipped
B. Tracks
C. Logistics
D. Ships