A.拉斷斷絲 B.磨損斷絲 C.疲勞斷絲
A.5% B.10% C.15%
A.只能發(fā)出開車 B.只能發(fā)出調(diào)平信號(hào) C.只能發(fā)出調(diào)平和換層信號(hào)