不发火(防爆)面层中碎石的不发火性必须合格;砂应质地坚硬、表面粗糙,其粒径应为(),含泥量不应大于(),有机物含量不应大于()
A.0.15~5mm,2%,0.5% B.0.2~5mm,3%,0.6% C.0.2~5mm,2%,0.6% D.0.15~5mm,3%,0.5%正确答案D
不发火(防爆)面层中碎石的不发火性必须合格;砂应质地坚硬、表面粗糙,其粒径应为(),含泥量不应大于(),有机物含量不应大于()
A.0.15~5mm,2%,0.5% B.0.2~5mm,3%,0.6% C.0.2~5mm,2%,0.6% D.0.15~5mm,3%,0.5%正确答案D