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【多选题】
停电，线路作业前应做好以下哪些措施( )A.
断开变电站或用户线路开关和刀闸
B.
断开需要工作班操作的线路各端开关，刀闸和熔断器。
C.
断开危及该线路的停电作业，且不能采取安全措施的交叉跨越，平行的同杆线路的开关和刀闸。
D.
断开有可能返回低压电源的开关和刀闸。
E.
断开变压器外壳接地线
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举一反三
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A.
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B.
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D.
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B.
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C.
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D.
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A.
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B.
controversial
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confident
D.
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