History, 07.12.2020 19:50 randlemccray4305

The dragon backbone pump was invented during the Song dynasty. What does a dragon backbone pump do? a. helps doctors treat bone illnesses b. helps pump water out of flooded boats c. allows one man to scoop water from one place and dump it into an irrigation canal d. automatically pumps arrows through a long tube Please select the best answer from the choices provided A B C D

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The dragon backbone pump was invented during the Song dynasty. What does a dragon backbone pump do?...

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