3 The soil is a clean gravel or clean sand if the percentage of fines is estimated to be 5%or less.
3 The soil is a clean gravel or clean sand if the percentage of fines is estimated to be 5%or less.
2如果砾石的百分含量比砂的百分含量估计的少,这个土就是砂.
3 The soil is a clean gravel or clean sand if the percentage of fines is estimated to be 5%or less.
2如果砾石的百分含量比砂的百分含量估计的少,这个土就是砂.