| 摘要 |
A plain surface wall is composed of an external wall (3) and a second wall (4) intended to be opposite the wall support to be covered. The second wall has a longitudinal over-thickness (1) which rests on the support and acts as a stiffener. The end abutting parts are composed of a U-shaped section (5) which receives an I-shaped section (6) of the adjacent wall.
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