well graded sand的意思|示意
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分级良好的砂
well graded sand的网络常见释义
级配良好砂 ... 级配良好的骨料 well-graded aggregate 级配良好砂 well graded sand; wellgradedsand 级配良好土 well-graded soil ...
级配砂 (良好)级配砂