单项选择题

Where is the most air freight shipped in the passenger aircraft?（）

A.Separately
B.In same level
C.In the lower part
D.Not mention here

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单项选择题

A.Less than 1%
B.Lowest
C.Lower
D.Low

单项选择题

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

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