皮皮学，免费搜题
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【单选题】
运营前( )分钟,行调应与各车站、车厂核对当前时间、当日执行《运营时刻表》,核实电调、环调、各车站、各车场运营前检查情况。A.
60
B.
45
C.
15
D.
30
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