Question
Asked by Mr.Jordan from usa | Nov. 20, 2009 12:17
About:What is the Great Wall of China made of?

How did they use crowbars, winding gears, and logs as machines???

Answers (2)
Answered by Ms.SLEEPYHAMSTER from China | Nov. 21, 2009 21:06
00Reply
I think these simple machines could save a lot of people's strength. The lever principle was adopted in the use of these machines.
Answered by Mrs.Skateboarder from USA | Dec. 01, 2009 15:38
00Reply
well they used the logs to sometimes roll heavy material to the work site that they may be at.
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