36 下列何者不是鋼軌研磨之種類?
(A)鋼軌斷面復原研磨
(B)鋼軌接頭研磨
(C)預防性研磨
(D)修復性研磨
答案:登入後查看
統計: A(303), B(990), C(100), D(77), E(0) #1607329
統計: A(303), B(990), C(100), D(77), E(0) #1607329