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当前学科：高铁线路工
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在电气化铁路线路上拨道作业，线路中心位移一次不得超过（）mm；一侧拨道量年度累计不得大于120mm，并不得侵入限界。
A . ±30
B . ±45
C . ±60
D . ±120
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