Epoxy or plastic liming may be cast into the concrete pipe during manufacture;or bitumastic or coal tar epoxy may be painted on the concrete pipe surfaces after installation.
可以在制造
管道时将环氧和塑胶衬里浇筑在里面，或在安装
青砂浆或
焦油屠宰管的表面。
Epoxy or plastic liming may be cast into the concrete pipe during manufacture;or bitumastic or coal tar epoxy may be painted on the concrete pipe surfaces after installation.
可以在制造管道时将环氧和塑胶衬里浇筑在里面，或在安装青砂浆或焦油屠宰管的表面。
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