GB 50261-2017 第5.4.4条
3. The installation of pipes within suspended ceilings in hotel guest rooms, corridors, etc. must strictly comply with the requirements of **** and **5.4.5** regarding sleeves and slopes.
3. The installation of pipes within suspended ceilings in hotel guest rooms, corridors, etc. must strictly comply with the requirements of **** and **5.4.5** regarding sleeves and slopes.
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