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A.Women and young girls had to work in the mines with the men.B.Children were allowed ..
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What is the author of this passage saying about .....
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噪声的特点是什么?..
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A.Because there was a shortage of men and women in the area.B.Because mining communiti..
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How often is physical science more accurate than .....
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Wben the error is small, the statistical principles used in dealing with it are ______ whe..
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