graded sand 粒级砂 ; 级配砂石 ; 级配砂 ; 分选砂
badly graded sand 级配不良的砂
Graded standard sand 级配标准沙 ; 标准级配砂 ; 级配骨材
well graded sand 级配良好砂 ; 级配砂
graded sand gravel 级配砂砾
poorly graded sand 不良级配砂
graded sand-gravel 级配砂石
badly y graded sand 级配不良的砂
The gravel frequently is sieved and graded sand that is packed in bags.
砾石通常是经过筛析和粒度分级的袋装砂子。
After reviewing a few design methods of sand gravel filters, a new design method of filter using broad graded materials is proposed in the paper.
本文在回顾了滤层保砂性设计的几种方法后，提出了广级配砂砾滤层保砂性的设计计算式。
The river deposit, which is made up of naturally graded sand and gravel, is characterized by its well gradation, easy control of its particle size, easy compaction and good permeability.
这种天然级配砂砾具有级配良好、粒径易控制、易碾压成型、透水性好等特点。
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