What kind of products do the air carriers deliver? （） The high value。 Low density or weight。 A and B。 To add cost。
（）is the disadvantage for air transportation? Quick but not safe。 Less frequency。 It can’t lift heavy goods。 the highest cost in all transport modes。
What is the meaning of “short hauls”? （） Near way。 The distance is not long。 Direct line。 Short road。
Container is most benefit for （） Transport, carrying, loading and unloading。 Storage。 Transporting。 Distribution。
Ocean transport use （）ships mostly. Bulk。 Container。 Barge。 RO/RO。
How long is the economic distance for motor? （）
