A.長(zhǎng)寬比 B.長(zhǎng)高比 C.寬高比 D.坡高比
A.板式樓梯 B.梁式樓梯 C.旋轉(zhuǎn)樓梯 D.室外樓梯
A.10~30mm B.30~70mm C.70~90mm D.90~120mm