免费无码又爽又刺激高潮虎虎视频

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              Longyan Sandstone Flowerpot Manufacturing Method

              Apr 29, 2019

              1. Turn the mold to make the opposite mold, which is convenient for casting.

              2. Lost wax production. It is a traditional casting method to cast a bronze statue by the lost wax method.

              3. The assembly and casting are completed in sections, and they must be assembled by welding.

              4. Surface treatment. According to the needs, the surface is treated with coloring, gold-plating, gold-plating and so on.

              005


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              免费无码又爽又刺激高潮虎虎视频
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