What is the meaning “speed is not of primary importance”? （） Speed is important。 Speed is not the most important。 Speed is mainly important。 Speed is first important。
What are transported mainly by water? （） Raw materials。 Heavy, bulky and low value commodities。 Semi-processed。 Great amount goods。
How many categories are there in water transport?（） 2。 3。 4。 Not available in the paragraph。
what kind of products do the air carriers deliver? （） The high value。 Low density or weight。 A and B。 Shortest time to transport。
What 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。
Where is the most air freight shipped in the passenger aircraft?（）
