Ключевые слова: balanced, beam, blue, building, chemical, color, crank, crude, drilling, drive, drop, economy, energy, environment, equipment, exploration, facilities, framework, fuel, gas, homework, industrial, machinery, manufacturing, metal, mineral, mining, natural, oil, oil field, petrochemical, platforms, pumping, rig, rotation, sky, solid, steel, swing, technology, tools, traditional, unit,