A . (A)1.5h
B . (B)1.2h
C . (C)0.9h
D . (D)0.6h
[单选题]甲级防火门的耐火极限为不低于_________。A.1.5hB.1.2hC.0.9hD.0.6h
[单选题]甲级防火门的耐火极限为不低于_____。A.1.5hB.1.2hC.0.9hD.0.6h
[单选题]甲级防火门的耐火极限为不低于( )。A.1.5hB.1.2hC.0.9hD.0.6h
[单选题]甲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]甲级防火门的耐火极限不低于()。A .0.60hB .0.80hC .0.90hD .1.20h
[单选题]甲级防火门的耐火极限不低于()。A.0.50hB.1.00hC.1.20hD.1.50h
[单选题]甲级防火门的耐火极限不低于()h。A .0.6B .0.9C .1.0D .1.2
[单选题]甲级防火门的耐火极限是不低于()。A.1.5hB.1hC.0.5hD.2h
[单选题]甲级防火门是指耐火极限不低于( )h的防火门。A.0.6B.0.9C.1D.1.2
[单选题]耐火极限不低于()h的门为甲级防火门。A .0.9B .1.2C .0.5D .0.6