搜索 - 科创

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农村化学试剂不好搞定想做重铬酸铵分解能买到重铬酸钾，却没有重铬酸钠，压根弄不到重铬酸铵，铬酸酐，店老板说没听说过……上网查重铬酸铵可以由重铬酸钠和氯化铵复分解制得，氯化铵没问题，但是，重铬酸钠弄不到于...

不必用单片机做的，不用这么复杂，因为不是用于数码管。只要给脉冲信号驱动8个LED即可，比如555发出一定频率让LED一个一个点亮这样的。

请问下大家,过期黑白120胶卷黑白负片.一卷(30张左右)能制备多少金属银?买来制备金属银1.25元一卷值吗?硝酸银都超过三百五十元一百克了.先谢谢了.

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