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Which mode has seen the greatest increase in U.S. freight ton mile between 1990 and 2006?

arock1

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6 years ago

Which mode has seen the greatest increase in U.S. freight ton mile between 1990 and 2006?

Which mode has seen the greatest increase in U.S. freight ton mile between 1990 and 2006?
a. Air
b. Truck
c. Rail
d. Water

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babyfacelove

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