d30
d30-
The distinguishing index and grading standards of expansive soil are recommended by Specifications for Design of Highway Subgrades ( JTG D30 – 2004 ) .
《公路路基设计规范》（JTGD30–2004）建议的膨胀土判别与分类的新指标未经广泛验证，其适用性有待探讨，其分级标准更需广泛的试验验证。
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The average egg weight , the body weight at D30 , the body weight at D60 and the activity of GPT at D60 were the main traits for the contribution .
在这些性状中起主要作用的性状有：平均蛋重、30日龄体重、60日龄体重及60日龄血液中GPT的活性。