免费无码又爽又刺激高潮虎虎视频

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              New curbstone for cement pavement

              Jun 01, 2019

              New type of curbstone for cement pavement, similar in dimensions to existing curbstones. It has a rectangular structure with a length, width and thickness of 75 cm × 35 cm × 25 cm. The upper layer is 19 cm thick ordinary concrete and the lower layer is 6 cm Porous concrete is compositely cast, and the outer side of the back has 5cm × 3cm penetrating recessed holes and culverts along the length direction. The edge stone is suitable for roads with a cement surface thickness of 22 cm (roads with a cement surface thickness greater than or less than 22 cm). cm).


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              免费无码又爽又刺激高潮虎虎视频
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