短語詞組短語train operation by signal indication 按信號顯示行車micro -operation signal generator 微操作信號發(fā)生器signal operation 信號控制;信號操作;信號節(jié)制signal operation instruction 通信作業(yè)須知small signal operation 小信號操作signal operation circuit 信號運算電路reverse travel signal operation 倒退行駛信號的工作signal operation instructions 通信作業(yè)教令;信號操作指令large signal operation 大信號操作 返回 operation signal