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.
可以制造混凝土管道时将环氧和塑面,或安装后用沥青砂浆或煤焦油屠宰混凝土管的表面。
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But on the other hand, I will take it with a grain of salt, liming what you said.
但另一方 你的疑态度。
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