GB 50311-2016 第7.3.1条
| **** | The vertical backbone subsystem shall be installed in metal cable trays or cable shafts. Cables in the shaft shall be neatly arranged, and fixing brackets shall be provided. |
| **** | The vertical backbone subsystem shall be installed in metal cable trays or cable shafts. Cables in the shaft shall be neatly arranged, and fixing brackets shall be provided. |
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