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OpenStudy (anonymous):
Which was not a labor-saving device that first appeared around the beginning of the twentieth century? A. washing machine B. spinning wheel C. sewing machine D. vacuum cleaner
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OpenStudy (thegamer007):
its D
OpenStudy (thegamer007):
vacuum cleaner
OpenStudy (zenyu):
I know this is late, but the correct answer is the spinning wheel, which appeared around the 11th century.
OpenStudy (is3535):
b
OpenStudy (anonymous):
@zenyu is right
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