GB爆炸性气体环境用电气设备第3部分:增安型"E"
GB爆炸性气体环境用电气设备第4部分:本质安全型"I"
GB爆炸性气体环境用电气设备第5部分:正压型"P"
GB爆炸性气体环境用电气设备第6部分:充油型"O"
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