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[单选题]
混凝土外加剂性能检验,混凝土凝结时间测定,每次测点应避开前一次测孔,其净距为试针直径的2倍,但至少不小于(),试针与容器边缘之距离不小于25mm。
A.5mm
B.10mm
C.15mm
D.20mm
查看答案
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A.5mm
B.10mm
C.15mm
D.20mm
A.3h~4h
B.1h~2h
C.4h~6h
D.6h~8h
A.3h~4h
B.1h~2h
C.4h~6h
D.6h~8h
A.3h~4h
B.1h~2h
C.4h~6h
D.6h~8h
A.(20±1)℃
B.(20±2)℃
C.(20±3)℃
D.(20±5)℃