搜索 - 科创

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一直非常喜欢这类大功率元器件所以前一阵子买了几个做收藏，但是苦于找不到型号，请问有了解这类丝印的大佬吗？

我想用3节手机电池串联使用（已经焊好了）但是知道要并联充电，那就还要再焊成并联的。我现在有一个三向开关，电池和其他，谁能给个主意？给个电路图，谢了。还有电脑主机后面的4个USB插口是不是12V电源的？

·我的银项链不小心掉到三氯化铁溶液里面了，白白的一条链子，现在成黑色的了，我用肥皂水把残留的三氯化铁溶液清洗了，可还是黑的，高人们指点指点怎么才可以让链子恢复到原来的银色？？小弟先谢谢各位高人了！

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