| 摘要 |
Inside a structural section 11 having an essentially rectangular cross-section is provided a closed cavity 12 which has a cross-shaped cross-section. On two opposite sides 15 of the section there is arranged in each case one cavity 16 to which access can be gained from the outside and on the two other opposite sides 18 there are arranged in each case two cavities 19 to which access can be gained from the outside. <IMAGE>
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