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进行进入受限空间作业时,如果内部潮湿其使用的临时照明电压应该低于()A、36vB、24vC、12vD、6v...
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转化器拆大盖前,将转化器内温度降至()A、60℃以下B、80℃以下C、100℃以下D、120℃以下...
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