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[单选题]
水泥安定性试验用雷氏夹指针根部挂上砝码时,两根指针的针尖距离增加应在()范围内。
A.17.5±2.5mm
B.17.5±1.5mm
C.15.5±2.5mm
D.17.5±1.5mm
查看答案
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A.17.5±2.5mm
B.17.5±1.5mm
C.15.5±2.5mm
D.17.5±1.5mm
A.9.0mm
B.11.0mm
C.13.0mm
D.15.0mm
E.17.0mm
A、立即将已制好的标准稠度净浆一次装满雷氏夹
B、装浆时一只手轻轻扶持雷氏夹,另一只手用宽约25mm的直边刀轻轻插捣3次
C、然后抹平,盖上稍涂油的玻璃板
D、接着立即将试件移至湿气养护箱内养护20h~24h
A.每个试样需成型两个试件
B.雷氏夹试件插捣完成后应立即将试件移至湿气养护箱内养护24±2h
C.沸煮箱应保证在40±5min内升至沸腾
D.脱去玻璃板取下试件,先测量雷氏夹指针尖端间的距离,精确至0.5mm