| 摘要 |
Roof of a cesspools for treatment of waste waters consists from a roof cover, figure 4, made of plastics resistant to all chemical impacts and it floats and it hangs up onto the steel roof construction 9, figure 5. In that way the acid resistant roof cover, from figure 4, remains impacted to chemical influences of the cesspool, and the roof construction 9 is outside the cesspool seeking no additional protection.
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