A . (A)1.5h
B . (B)1.2h
C . (C)0.9h
D . (D)0.5h
[单选题]丙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]丙级防火门的耐火极限为不低于_____。A.1.5hB.1.2hC.0.9hD.0.5h
[单选题]丙级防火门的耐火极限为不低于( )。A.1.5hB.1.2hC.0.9hD.0.5h
[单选题]丙级防火门的耐火极限为不低于( )。A.1.5hB.1.2hC.0.9hD.0.5h
[单选题]丙级防火门的耐火极限为不低于()小时A.1.5B.1.2C.0.9D.0.5
[单选题]丙级防火门的耐火极限不低于()。A .0.60hB .0.90hC .1.00hD .1.20h
[单选题]丙级防火门的耐火极限不低于()。A.0.50hB.1.00hC.1.20hD.1.50h
[单选题]丙级防火门的耐火极限是不低于()。A.1.5hB.1hC.0.5hD.4h
[单选题]甲、乙、丙级防火门的耐火极限分别不低于()。A .1.00h,1.00h,1.00hB .1.00h,1.50h,0.50hC .1.50h,1.00h,1.00hD .1.50h,1.00h,0.50h
[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