A.周 B.月 C.季 D.年
A.整修、更換軌道部件,并有計(jì)劃地對(duì)聯(lián)結(jié)零件涂油 B.更換失效的可動(dòng)心軌凸緣與接頭鐵連接螺栓 C.有計(jì)劃的對(duì)軌道板裂紋、掉塊進(jìn)行修復(fù) D.根據(jù)位移和鎖定軌溫情況,有計(jì)劃地對(duì)無(wú)縫線路進(jìn)行應(yīng)力調(diào)整或放散