Tuesday, May 31, 2011
Thursday, May 26, 2011
Suspension bridge
1:The Suspension bridge is ideal for over water.2:Single steel wire 0.1 inch thick can support over .5 tones without breaking.
3:A famous suspension bridge is the Golden Gate bridge.
Tuesday, May 24, 2011
Tuesday, May 17, 2011
Thursday, May 12, 2011
Monday, May 9, 2011
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