разница между

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The difference in tension between the tight and loose sides of a flat belt equals ...

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The difference in the magnitude of the five coefficients ...

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There is significant disparity (or difference, or divergence, or discrepancy) between the grades of ...

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Wide variations in life between circuits that have different functions ...

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The distinction between heterogeneous and homogeneous mixtures is an arbitrary one.

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As yet nobody has been able to produce direct evidence of any structural difference among cones.