6 鐵路列車軸重愈高則應選擇何種鋼軌?
(A)越輕的鋼軌
(B)越重的鋼軌
(C)無關
(D)視氣候而定鐵路
答案:登入後查看
統計: A(162), B(5522), C(76), D(35), E(0) #1607249
統計: A(162), B(5522), C(76), D(35), E(0) #1607249