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[多选题]
凡影响行车的线路施工(特别规定的慢行施工除外)、维修作业,都必须纳入天窗,不得利用列车间隔进行。用于线路大修及大型养路机械作业的施工天窗不少于,维修天窗双线不应少于、单线不应少于。支线铁路应优化天窗设置,宜安排昼间天窗()
A.180min
B.120min
C.90min
D.60min
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A.180min
B.120min
C.90min
D.60min
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