A.嚴禁B.不得C.必須
A.發(fā)信號―斷點啟動―正式啟動 B.發(fā)信號―斷點啟動―發(fā)信號―正式啟動 C.發(fā)信號―正式啟動 D.斷點啟動―正式啟動
A.齒輪嚙合不正常 B.溜槽里煤量過多 C.刮鏈板過松 D.連接螺栓松動或脫落
