混凝土的粗骨料分为大石、中石和小石。中石的粒径是
A.20 ~40mm
B.10~20mm
C.5 ~10mm
D.40~60mm
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正确答案: A 答案分析:无
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A.20 ~40mm
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B.10~20mm
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D.40~60mm
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C.5 ~10mm
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