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电压表与用电器串联时电流表几乎为零，为什么？
九年级物理小实验视频，18/34
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App03:55打开App观看
App04:34App01:20App02:20App01:12App01:56App01:37App02:33App02:23App03:43App01:23App01:15App01:34App01:18App01:04App02:11App01:40App01:33App03:55
