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.
可以在制造混凝土
将环氧和塑胶衬
浇筑在面，
在安装后用沥青砂浆
油屠宰混凝土的表面。
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.
可以在制造混凝土将环氧和塑胶衬浇筑在面，在安装后用沥青砂浆油屠宰混凝土的表面。
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