What is the r (ω/km) when the frequency is 10k?
CREATE TABLE "characteristics_of_telephone_cable_as_a_" (
  "frequency_hz" text,
  "r_km" text,
  "l_m_h_km" text,
  "g_s_km" text,
  "c_n_f_km" text
);
SELECT "r_km" FROM "characteristics_of_telephone_cable_as_a_" WHERE "frequency_hz"='10k';