On June 20, 1971, the People's Daily announced the "Industrial Day" as the day of the celebration, the first to focus on leading the principle of combining the mass movement, to rule the principle of the high revolutionary spirit with the strict scientific attitude, to solve the problem of the old university, to solve the question of the old university, to solve the question of the old university, to solve the question of the political philosophy of the president, to meet the four ideas and ideas of the first "thirty-eight" style, to carry out the "four good" movements, to the third movement, to concentrate on the masses, to explain why the principle of production is combined, to adhere to the spirit of production, to the fundamental attitude of life, to see the implementation of the principle of socialism,