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.
在制造混凝土
道时将环氧和塑胶衬
浇筑在面，或在安装后用沥青砂浆或煤焦油屠宰混凝土
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.
在制造混凝土道时将环氧和塑胶衬浇筑在面，或在安装后用沥青砂浆或煤焦油屠宰混凝土面。
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