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f凝土试件应先随同结构构件同条件蒸汽养护,再转入标准条件养护,共__。A.7dB.12dC.28dD.30d17、在目前较普遍的供应方式是__,这种方式一方面可以充分利用发包方的资金优势、采购渠道优势,另一方面又能使施工企业发挥其主动性和灵活性,提高投资效益。A.发包方供应方式B.承包方供应方式C.中转供应方式.D.承发包双方联合供应方式18、在炎热夏季进行大体积混凝土施工时,必须加入的外加剂是__。A.速凝剂B.缓凝剂C.CaSO4D.引气剂19、材料抵抗其他较硬物体__的能力,称为硬度。A.摩擦B.压入C.磨损D.磨耗20、砌筑水泥中混合材料掺加量按质量百分比计应大于__。A.30B.40C.50D.6021、钢材拉伸试验中试件的伸长率,就是试样拉断后,其标距部分__与原标距长度的百分比。A.增加长度B.规定长度C.原标距长度D.标准长度22、优等烧结普通砖的两条面高度差应小于等于__。A.2mmB.3mmC.4mmD.5mm23、Thecellpho
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