发布时间:2025-01-25 02:40:17
要求正负相连,就是说不能相同的极接到一块输出总的电动势等于两个电源电动势之和,也就是说串联后相当于一个大的电源
想把pvc下水管卧墙里锯断了物业必须让恢复但是管上下固定了没余量怎么接
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