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單項選擇題

道口欄桿關閉后高出路面不應小于（）

A.0.5米
B.1米
C.1.5米
D.2米

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單項選擇題

道口欄桿關閉后高出路面（）。

A.0.5-0.8米
B.0.7-1米
C.1-1.2米
D.1.2-1.5米

單項選擇題

電氣化區(qū)段道口欄桿（門）一般距鋼軌外側（）以上。

A.8米
B.6米
C.4米
D.2米

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