单项选择题
设置在闭塞分区入口处的应答器组距调谐单元或机械绝缘节()
A.100m±0.5m
B.150m±0.5m
C.200m±0.5m
D.250m±0.5m
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单项选择题
A.100m±0.5m
B.150m±0.5m
C.200m±0.5m
D.250m±0.5m
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