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发车时，对发车指示信号或发车信号辨认困难，而中转信号又延长站停时间的车站，应在便于司机瞭望的地点装设（）。
A . A.进路表示器
B . B.发车表示器
C . C.道岔表示器
D . D.发车线路表示器
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