A.防火 B.火災(zāi)報警 C.滅火設(shè)備 D.火災(zāi)與緊急響應(yīng)
A.安裝巖粉棚 B.礦井除塵 C.清除煤塵 D.安裝隔爆水棚
A.50m B.70m C.80m D.150m