A.非金屬 B.金屬 C.鋁合金 D.不銹鋼
A.10s B.20s C.30s D.60s
A.合側板—上部小側板—合背板—鎖緊拉桿 B.合背板—鎖緊拉桿—合側板—上部小側板 C.合側板—鎖緊拉桿—合背板—上部小側板 D.合背板—上部小側板—合側板—鎖緊拉桿