A.1 B.2 C.3 D.4
A.一级 B.二级 C.三级 D.四级
A.300㎡,3层 B.300㎡,5层 C.1000㎡,2层 D.1000㎡,5层
A.0.1m B.0.15m C.0.2m D.0.5m
A.小于30m B.小于25m C.大于30m D.大于25m