| 摘要 |
Tile for covering roof area belongs to the field of civil engineering. The tile consists of the following elements a flat plate (1), a slant plate (2), (3) and (4) vaulted plate (5) and (6), being each to other connected along the tile lengths into one monolith wholeness making a tile described in this application. The surfaces of the cross-sections at any place along the length of the tile have the same geometrical characteristics and numerical values.
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