【Daily Question】【Civil Engineering Version 20180621

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Which of the following statements is correct? (    )       A. A floor slab generally consists of a surface layer and a structural layer.      B. The structural layer is the horizontal load-bearing component of a building.     C. In rooms with special functional requirements, an additional layer may also be required for the floor.      D. The additional layer is usually placed above the surface layer.     E. The surface layer serves to divide the vertical spaces within a building, as well as to provide fire protection and sound insulation. Answer: ABC     【Explanation】A floor slab generally comprises several basic layers, including the surface layer, the structural layer, and the ceiling layer. The finish layer, also known as the floor surface or flooring, is the finished surface on the upper side of a floor slab ； The structural layer is the horizontal load-bearing component of a building, mainly including slabs and beams, and it serves to divide the vertical spaces within the building, as well as to provide fire protection and sound insulation. The ceiling is the structural layer beneath the floor surface, as well as the decorative layer at the upper part of the indoor space. The floors of certain rooms with special usage requirements also require an additional layer to be installed. Additional layers are usually placed between the surface layer and the structural layer; they include sound-insulating layers, waterproof layers, as well as insulation or heat-insulation layers.