The installation process, the buckets of rain water pipes and open closure measures to be taken by mouth.

安装过程中，管道及雨水斗的敞开口应采取封堵措施。

youdao

The installation process, the buckets of rain water pipes and open closure measures to be taken by mouth.

安装过程中，管道及雨水斗的敞开口应采取封堵措施。

youdao