| 摘要 |
The board (1) has a length measured along a longitudinal direction between two ends and a width measured along a transverse direction between two edges (4, 5). Height of the board is measured between a bottom surface (6) and a top surface (7). A median longitudinal spacer (45) is arranged between a lower reinforcement (22) and an upper reinforcement (24), where the spacer directly connects the lower reinforcement to the upper reinforcement. |
