有本少年电工，教自制万用表，不过超细漆包线很难找。还教自制发电机，用铁皮焊成外壳，装满用磁铁从沙坑吸的铁砂做铁芯。

来源: pvct 于 2025-11-16 22:18:38 [旧帖] [给我悄悄话] 本文已被阅读：次

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