电缆井和配电竖井是施工完成厚得在每层楼板处封上不防火封堵用c20混凝土封堵可以吗
2025-01-21 18:54:06 2025-01-21 18:54:06 2025-01-21 18:54:06 2025-01-21 18:54:06 2025-01-21 18:54:06 2025-01-21 18:54:06 2025-01-21 18:54:06 2025-01-21 18:54:06 2025-01-21 18:54:06 2025-01-21 18:54:06 2025-01-21 18:54:06 2025-01-21 18:54:06 2025-01-21 18:54:06 2025-01-21 18:54:06 2025-01-21 18:54:06 2025-01-21 18:54:06 2025-01-21 18:54:06 2025-01-21 18:54:06 2025-01-21 18:54:06 2025-01-21 18:54:06 2025-01-21 18:54:06 2025-01-21 18:54:06 2025-01-21 18:54:06 2025-01-21 18:54:06 2025-01-21 18:54:06 2025-01-21 18:54:06 2025-01-21 18:54:06 2025-01-21 18:54:06