题目内容

按《岩土工程勘察规范》(GB 50021—2001)，砂土(粉砂)和粉土的分类界限是 ()。

A. 粒径大于0.075mm的颗粒质量超过总质量50%的为粉砂，不足50%且塑性指数Ip≤10的为粉土
B. 粒径大于0.075mm的颗粒质量超过总质量50%的为粉砂，不足50%且塑性指数Ip＞3的为粉土
C. 粒径大于0.1mm的颗粒质量小于总质量75%的为粉砂，不足75%且塑性指数 Ip＞3的为粉土
D. 粒径大于0.1mm的颗粒质量小于总质量75%的为粉砂，不足75%且塑性指数 Ip＞7的为粉土

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