到达解体列车的摘管作业是按照（）的要求，将车组分解处的制动软管摘开。
A.阶段计划
B.调车作业计划
C.编组计划
D.拉风作业
参考答案：B
_____ asleep _____ a knock at the door awakened her. [ ]
A. Scarcely had she fallen; than
B. No sooner did she fall; than
C. Hardly she had fallen; when
D. Hardly had she fallen; when
ATC共有几个天线（）.
A.1个
B.2个
C.3个
D.4个
