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[" 131.For and EMWave,"],[qquad [E=E(0)s...

[" 131.For and EMWave,"],[qquad [E=E_(0)sin12times10^(6)[Z-2times10^(8)t](N)/(C)],[" in a medium,then its refractive index is "],[" 1) "2/3," 3) "4/3],[" 2) "3/2," 4) "5/3]]

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