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【单选题】
悬挂线路警告牌的工作应按下列哪种方式进行（）。
A.
办理线路第一种工作票
B.
办理线路第二种工作票
C.
口头或电话命令
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参考答案：
参考解析：
刷刷题刷刷变学霸
举一反三
【单选题】Subways are underground trains, which usually operate 24 hours a day. They are found in larger cities and usually run between the suburbs and the downtown area. Maps and schedules are available from t...
A.
within downtown areas
B.
away from city centers
C.
in or outside big modern cities
D.
between suburbs and city centers