搜索 - 科创

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1 LED背光，串个300~600欧姆的电阻接3.3V，用电位器可以调节背光亮度2 VIN----Video in3 GND-接地4 -5V---接负电5 GND-接地以上应共地

1.氧化钾、四氧化三锰、氧气2.会产生硫酸钾和二氧化锰之类的。。。(2KMnO4+S=K2SO4+2MnO2)3.研磨即可。。。又不会爆炸。。。(我研磨过)但和硫磷不要研磨。。。

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