american association state highway officials
...ican Society of Civil Engineer美国土木工程师学会 AASHTO= American Association State Highway Officials美国州公路官员协会 Darcy's law 达西定律 ..
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american association state highway officials
美国州公路官员协会
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The United States Conference of Mayors, American Association of State Highway and Transportation Officials and America 2050 -- a coalition of regional planners, scholars and policy-makers -- back high-speed rail plans.
CNN: Is the U.S. turning a corner on high-speed rail?