单项选择题

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

A. separately
B. Not clear
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