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[" 82.Two metal rods have coefficients o...

[" 82.Two metal rods have coefficients of linear "],[" expansion "1.1times10^(-5)%C" and "1.65times10^(-5)PC],[" respectively.The difference in lengths is "10cm],[" at all temperatures.Their initial lengths must "],[" be respectively."],[[" 1) "40cm" and "50cm," 2) "40cm" and "30cm],[" 3) "50cm" and "60cm," 4) "30cm" and "20cm]]

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