发布时间:2025-02-01 19:29:29
变频器供电笼型异步电机应用导则指出:应该两端接地。个人意见,先按照两端接地试验,若地电流较大的话,可考虑改为单端接地!
根据人民防空地下室设计规范要求下列何种管道可穿过人防围护结构
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