59.已知拉杆横截面积 =100(mm)^2, 弹性模量 =200GPa, 横向变形-|||-系数 mu =0.3, 轴向拉力 =20kN, 拉杆的横向应变ε是 () 。-|||-__ __ __ __ __-|||-F F-|||-题59图-|||-

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