【名词&注释】
建筑物(building)、建筑工程(construction engineering)、工业建筑(industrial architecture)、民用建筑(civil building)、耐火等级(fire resistance classification)、公共建筑(public building)、有利于(beneficial to)、市场公平竞争(fair market competition)
[单选题]耐火等级为二级时,楼板和吊顶的耐火极限应分别满足[]
A. A.1.50h,0.25hB.1.00h,0.25hC.1.50h,0.15hD.1.00h,0.15h