【多选题】
下列作业中，需要使用大锤的是哪两项？ ___
A. 更换夹板作业
B. 更换轨下胶垫
C. 整改接头错牙
D. 整改水平不良
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答案
AC
解析
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A. 主站在正线车站的调运备轨作业
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关于曲线外轨超高设置的目的，叙述不正确的是哪两项？ ___
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如多个A2类施工需要在同一地段作业时，关于红闪灯设置说法错误的三项是？ ___
A. 相邻两个红闪灯之间至少有0.3米以上的距离
B. 相邻两个红闪灯之间至少有0.5米以上的距离
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如果因故需要延长作业时间，施工负责人需提前经主站向行调申请，由值班主任进行批准，关于提前时间说法错误的三项是？ ___
A. 需在作业结束时间前30分钟申请延点
B. 需在作业结束时间前20分钟申请延点
C. 需在作业结束时间前10分钟申请延点
D. 需在作业结束时间前5分钟申请延点
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