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rural household appliances earthing protection
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rural household appliances earthing protection
Encyclopedia
农学
﹝农业电气化与信息化工程﹞
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rural household appliances earthing protection
农村家用电器接地保护
将正常运行时不带电,而在绝缘材料损坏或故障情况下,可能呈现危险的对地电压的家用电器金属外壳与接地装置之间作良好的电气连接。
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perfect cubic polynomial
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perfect graph theorem
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