发布时间:2025-01-30 00:57:58
直流电有正(十)负(一)极性之分,没零线火线的之分。直流脱扣器只是一个用直流24v励磁的线圈,有两个接线端子,无特殊要求的话,正线负线随意接。
哪位大侠有中国地图的准确cad版本包括各个城市的准备位置跪求
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