中砂（medium sand）是指粒径在0.5mm-0.25mm范围内碎屑物。
n. velvet
misc. medium sand
对用硫铁矿粉替代普通砼中砂的可能性进行了介绍；
This paper introduces possibility of replacing sand by pyrite dust in concrete, recommends using pyrite dust in semi - dry concrete.
对中砂的中低氨氮进水系统，通过缩短水力负荷周期，会使去除效果得到明显改善。
For the medium sand system of the low ammonia nitrogen, by shortening HLC, the removal effect of the system is significantly improved.
针对印刷中砂目和感光层的磨损，采用因子设计法设计实验，保证了实验的准确性。
For the PS plate grain and light-sensitive coating abrasion, an experiment was designed based on factor design, which ensures the veracity of experiments.
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