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90. Вычислить сопротивление графитового проводника, изготовленного в виде прямого кругового усеченного конуса высотой h = 20 см и радиусами оснований r1 = 12 мм и r2 = 8 мм. Температура проводника 20° С.
90. Вычислить сопротивление графитового проводника, изг