Deer. A Tale of Two Cities is a long historical novel set in the French Revolution by the British writer Charles Dickens. First published in 1859, the history of Baotou began with deer. Steel is the general name of iron-carbon alloy with carbon content of 0.02%-2. 1 1%. Coal mines are areas where human beings exploit coal resources in rich coal mining areas, which are generally divided into underground coal mines and open-pit coal mines. When the coal seam is far away from the surface, it is generally chosen to dig underground tunnels for coal mining, which is called underground coal mines.