Подчеркните независимый причастный оборот. Предложения переведите: 1. The new method having been studied in details, the engineers introduced it at the plant. 2. The problems of transition to the new type of traction having been solved, the train speed has increased considerably. 3. A large research centre was built last year, all its laboratories being equipped with new instruments. VI. Подготовьте письменную аннотацию на текст