单项选择题
A.5.0%B.2.0%C.1.5%D.0.75%
A.5.0%B.6.0%C.2.0%D.3.0%
A.24h±10minB.24h±15minC.24h±20minD.24h±30min
A.抗压强度B.抗劈裂强度C.抗折强度D.抗弯拉强度
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