This paper proceeds some discussion about the optimized sand-ratio, ave rage paste thickness and aggregate packing degree in the packing concrete mix proportion design.

本文对密实混凝土配合比设计中的最优砂率、平均胶结浆体厚度、骨料密实度进行了一些探讨。

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Green packing requires reducing the cost of commodity packing and the pollution degree of environment caused by discard.

绿色包装既要降低商品包装的成本，又要降低包装废弃物对环境的污染程度。

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Conical degree spiral packing has the advantage in the handling ability, pressure drop and dynamic holdup liquid and so on.

此填料具有处理能力大，阻力压降小，动持液量大、制作简易等优点。

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