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Mathematics 15 Online
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

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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