A.A B.B1 C.B2 D.B3
A.100° B.125° C.140° D.165°
A.該層人數(shù) B.該層以下疏散人數(shù)最多一層的疏散人數(shù) C.該層及以下疏散人數(shù)最多一層的疏散人數(shù) D.建筑物各樓層平均疏散人數(shù)