樓梯踏步的坡度在下列()組較合適。 Ⅰ.15° Ⅱ.30° Ⅲ.50° Ⅳ.60° Ⅴ.70° Ⅵ.40°
A.Ⅰ、Ⅱ B.Ⅲ、Ⅳ C.Ⅴ、Ⅵ D.Ⅱ、Ⅵ
A.樓梯踏步中點(diǎn)到扶手 B.樓梯踏步前緣到扶手 C.樓梯踏步任意點(diǎn)到扶手 D.樓梯踏步1/3處到扶手
A.1/2~1/3 B.1/4~1/5 C.1/5~1/8 D.1/8~1/12