Concrete Grade 30/20 代表咩?
30 代表咩?
20代表咩?
Concrete Grade 30/20 代表咩?
2008-06-25 9:48 pm
回答 (1)
2008-06-26 5:21 am
✔ 最佳答案
Concrete Grade 30/20 代表咩?30 代表:strength is 30MPa at 28 days old
20代表:stone aggregate size, 20mm mesh
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