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[" 40.The proportional limit of steel is...

[" 40.The proportional limit of steel is "8times10^(8)N/m^(2)" and "],[" its Young's modulus is "2times10^(11)N/m^(2)" .The "],[" maximum elongation,a one metre long steel wire "],[" can be given without exceeding the proportional "],[" limit is "]

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