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【多选题】
线路有效长由()因素确定。
A.
警冲标
B.
道岔的尖轨尖端(无轨道电路时)或道岔基本轨接缝处的钢轨绝缘(有轨道电路时)
C.
出站信号机(或调车信号机)
D.
尽头线车档(挡车器)
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【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
相关题目：
【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
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