【名词&注释】
建筑物(building)、耐火等级(fire resistance classification)、体育馆(gymnasium)、住宅楼(residential building)、承重墙(bearing wall)、展览馆(exhibition hall)、行政办公楼(administration building)
[单选题]耐火等级为二级时楼板和吊顶的耐火极限应满足()。
A. 1.50h,0.25h
B. 1.00h,0.25h
C. 1.50h,0.15h
D. 1.00h,0.15h