搜索 - 科创

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在别人那儿见用烙铁焊接铝水箱的加了一点助焊剂很容易上锡有没有知道是什么化学助剂的网上只见有卖的没有配方啊貌似有锌锡硫酸还是盐酸只类的那位知道的介绍下

把单摆摆到最高点的时候沿垂直于速度的方向推一下，发现此后单摆的运动中，最高点连线的方向在缓慢变化这一现象是如何产生的?是两个方向周期的微小差异导致的吗

今天用TDA2030做BTL功放，接好后把电脑输出和功放板接起来，通电，发现音量稍微开大点，喇叭就破音、嗞啦嗞啦的；把输入处串入3.6k电阻，音量可以开大了，但是静态噪音非常大，请问这是什么原因？

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