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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???

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Answers (2)

Answered by Ms.SLEEPYHAMSTER from China | Nov. 21, 2009 21:06

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I think these simple machines could save a lot of people's strength. The lever principle was adopted in the use of these machines.

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Answered by Mrs.Skateboarder from USA | Dec. 01, 2009 15:38

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well they used the logs to sometimes roll heavy material to the work site that they may be at.

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