A.1dB.3dC.7dD.28d
A.應(yīng)取兩次試驗結(jié)果的算術(shù)平均值作為該砂漿的分層度值B.分層度值精確到1mmC.當(dāng)分層度試驗值之差大于10mm時應(yīng)重新取樣測定D.當(dāng)分層度試驗值之差超過2%時應(yīng)重新取樣測定
A.40mmB.50mmC.60mmD.70mm