A.1.5h
B.1.2h
C.0.9h
D.0.6h
[单选题]乙级防火门的耐火极限为不低于()。A . (A)1.5hB . (B)1.2hC . (C)1.0hD . (D)0.6h
[单选题]乙级防火门的耐火极限为不低于()。A.1.5hB.1.2hC.1.0hD.0.6h
[单选题]乙级防火门的耐火极限为不低于_____。A.1.5hB.1.2hC.1.OhD.0.6h
[单选题]乙级防火门的耐火极限为不低于( )。A.1.5hB.1.2hC.1.0hD.0.6h
[单选题]乙级防火门的耐火极限为不低于()小时A.3.5B.1.5C.1D.0.5
[单选题]乙级防火门的耐火极限不低于()。A .0.7HB .0.6HC .0.8HD .0.9H
[单选题]乙级防火门耐火极限不低于()h。A.0.50B.1.00C.1.50D.2.00
[单选题]乙级防火门的耐火极限不低于()h。A .0.7B .0.6C .0.8D .0.9
[单选题]乙级防火门的耐火极限不低于()小时。A.3.5B.1.5C.1D.0.5
[单选题]乙级防火门的耐火极限是不低于()。A.1.5hB.1hC.0.5hD.3h