单项选择题
A.50% B.45% C.35% D.25%
A.相邻一侧装有固定甲级防火窗 B.相邻一侧装有固定乙级防火窗 C.相邻两侧装有固定甲级防火窗 D.相邻两侧装有固定乙级防火窗
A.1.10m B.1.30m C.1.50m D.1.60m