A.2000 B.3000 C.4000 D.1500
A.25~30 B.30~40 C.40~50 D.50~60
A.20m B.25m C.100m D.120m
A.二层 B.三层 C.四层 D.五层
A.大于3000m B.大于1500m，小于等于3000m C.大于500m，小于等于1500m D.小于等于500m
