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The question was: Before factories developed, machinery was powered by? A. Use of internal combustion engines B. The steam engine C. Electrical power D. Using their muscles
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2 votes
The question was: Before factories developed, machinery was powered by?

A. Use of internal combustion engines
B. The steam engine
C. Electrical power
D. Using their muscles

User Nodir Rashidov
by
5.1k points

1 Answer

5 votes
the answer is d. using their muscles
User Sansalk
by
5.1k points
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