单项选择题
A.仅耐火完整性≥1.00hB.耐火隔热性≥0.50h,耐火完整性≥1.00hC.耐火完整性和耐火隔热性均≥1.00hD.耐火完整性和耐火隔热性均<1.00h
A.9B.10C.15D.20
A.10B.18C.20D.54