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Curb Stone Overview

Apr 11, 2019

Existing curbstones usually come in two forms, one is prefabricated for ordinary concrete, and the other is stone processing. They are both impermeable materials. The foundation under the curb is generally fine concrete, and it is also impervious. The bottom layer of the pavement is a thick, compacted foundation layer, which is an impermeable layer. In addition, the curbstone and the underlying foundation are impermeable, resulting in the water in the pavement layer cannot seep down or be discharged through the curbstone and its foundation.


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人妻 制服 出轨 中字在线