【多选题】【消耗次数：1】
下列属于基本安全用具有（）
①
A绝缘操作棒
②
B绝缘手套
③
C绝缘夹钳
④
D验电笔
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在同一根导管或线槽内有几个回路时，所有绝缘电线和电缆的绝缘等级确定原则是（??）。
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