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普速铁路营业线施工中，繁忙干线封锁3小时及以上或影响全站（全场）信联闭4小时及以上的施工；干线封锁正线4小时及以上或影响全站（全场）信联闭6小时及以上施工；繁忙干线和干线其他换梁施工属于（）。

单选题
2021-12-30 03:53
A、Ⅰ级施工
B、Ⅱ级施工
C、Ⅲ级施工
D、Ⅳ级施工
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正确答案
B
试题解析
标签： 1C420080铁路营业线施工安全管理措施 铁路工程 CMS专题 一级建造师
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逻辑运算符（AND、NOT、OR）的运算顺序是AND→OR→NOT。
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逻辑运算符（AND、NOT、OR）的运算顺序是AND→OR→NOT。
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