A.預應力鋼筋混凝土桿和普桿 B.預應力鋼筋混凝土桿和錐型桿 C.錐型桿和普桿 D.有限預應力鋼筋混凝土桿和部分預應力鋼筋混凝土
A.110 B.120 C.130 D.150
A.1:35 B.1:45 C.1:65 D.1:75