回复：还记得抗美援朝中美陆战一师被围后是怎么突围的？

The width of the water surface of the Min River beside the Wenchuan City is close to 100 m according to the measurement on Google Earth. A pre-fabricated bridge at such span with sufficient strength should be even out-weight the capacity of any land-based cranes. How can any of the aircraft to carry such large and heavy structure to the site.