單項(xiàng)選擇題

電話閉塞法行車接發(fā)列車作業(yè)標(biāo)準(zhǔn)發(fā)車作業(yè)順序正確的是（）,司機(jī)確認(rèn)路票無誤后,關(guān)閉車門、安全門;

A.①②③
B.③②①
C.①③②
D.③①②
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