GB 50261-2017 第5.4.1条
| **** | Before installing the pipe network, the pipes shall be straightened and debris inside the pipes shall be removed; during installation, debris inside the installed pipes shall be removed at all times. |
| **** | Before installing the pipe network, the pipes shall be straightened and debris inside the pipes shall be removed; during installation, debris inside the installed pipes shall be removed at all times. |
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